MODIFIED STREET CLASS REGULATIONS
NB: All text in red constitute the new rules for 2008
This category of Drag racing is mainly for championship Drag events taking place at various venues such as graded tracks that are sanctioned by MSA and consist of timing equipment capable of running both with and without Handicap Racing.
This category has been introduced to cater for basically stock vehicles where an engine swap has taken place. It is reserved for vehicles based on normal production models with a factory produced automotive-type engine. The body, drive train, chassis and other components may be altered or modified in accordance with class requirements. This category can run either heads up (as individual classes) or handicap (as a category), depending on the type of event. The minimum cut off in this category is 11.0 seconds and the maximum will be 16.5 seconds. Any vehicle/s running quicker than 11.00 seconds, regardless of whether it complies with these "Modified Street" class regulations will be classified as "Pro-Street" (at Championship events) and/or "Exhibition" vehicles (at non-Championship events). This category can run either heads-up (as individual classes) or handicap (as a category), depending on the type of event.

DESIGNATION: 8A/M, 8B/M, 8C/M, 6AF/M, 6AR/M 6BF/M, 6BR/M, 6CF/M, 6CR/M, 5AF/M, 5AR/M 5BF/M, 5BR/M, 5CF/M, 5CR/M, 4AF/M, 4AR/M, 4BF/M, 4BR/M, 4CF/M, 4CR/M, followed by the competition number.
 
8 Cylinders
8A/M
 Any 8-cylinder normally aspirated.
8B/M
 Any 8-cylinder with one form of supercharging (i.e. turbo or nitrous or supercharger)
8C/M
 Any 8-cylinder fitted with two forms of supercharging (i.e. turbo/nitrous, supercharger/nitrous).
6 Cylinders Front and Rear Wheel Drive
A
 FRONT WHEEL DRIVE
6AF/M
 Any 6-cylinder [FWD] normally aspirated
6BF/M
 Any 6-cylinder [FWD] with one form of supercharging (i.e. turbo or nitrous or supercharger)
6CF/M
 Any 6-cylinder [FWD] with two forms of supercharging (i.e. turbo/nitrous, supercharger/nitrous).
A
 REAR WHEEL DRIVE
6AR/M
 Any 6-cylinder [RWD] normally aspirated
6BR/M
 Any 6-cylinder [RWD] with one form of supercharging (i.e. turbo or nitrous or supercharger)
6CR/M
 Any 6-cylinder [RWD] with two forms of supercharging (i.e. turbo/nitrous, supercharger/nitrous).
5 Cylinders Front and Rear Wheel Drive
A
 FRONT WHEEL DRIVE
5AF/M
 Any 5-cylinder [FWD] normally aspirated
5BF/M
 Any 5-cylinder [FWD] with one form of supercharging (i.e. turbo or nitrous or supercharger)
5CF/M
 Any 5-cylinder [FWD] with two forms of supercharging (i.e. turbo/nitrous, supercharger/nitrous).
A
 REAR WHEEL DRIVE
5AR/M
 Any 5-cylinder [RWD] normally aspirated
5BR/M
 Any 5-cylinder [RWD] with one form of supercharging (i.e. turbo or nitrous or supercharger)
5CR/M
 Any 5-cylinder [RWD] with two forms of supercharging (i.e. turbo/nitrous, supercharger/nitrous).
4 Cylinders Front and Rear Wheel Drive
A
 FRONT WHEEL DRIVE
4AF/M
 Any 4-cylinder [FWD] normally aspirated
4BF/M
 Any 4-cylinder [FWD] with one form of supercharging (i.e. turbo or nitrous or supercharger)
4CF/M
 Any 4-cylinder [FWD] with two forms of supercharging (i.e. turbo/nitrous, supercharger/nitrous).
A
 REAR WHEEL DRIVE
4AR/M
 Any 4-cylinder [RWD] normally aspirated
4BR/M
 Any 4-cylinder [RWD] with one form of supercharging (i.e. turbo or nitrous or supercharger)
4CR/M
 Any 4-cylinder [RWD] with two forms of supercharging (i.e. turbo/nitrous, supercharger/nitrous).
A
ARTICLES
MS 1 : BALLAST
A
 Ballast is permitted but must be securely mounted. (Refer to the Safety Regulations).
MS 2 : BATTERY (Refer to the Safety Regulations)
MS 3 : BODY / CHASSIS
A
3.1
 The complete original body must be retained except that the bonnet, boot-lid and fenders may be replaced with components of identical size and shape made from fibreglass or any similar non-flammable lightweight material.
A
3.2
 Moderately customised vehicles may compete in this class but bodies may not be chopped, channelled, sectioned or otherwise altered in height, width or contour. Convertibles, panel vans, bakkies, cars and readily available, locally produced replicas, (i.e. Cobras), may compete in this class providing all requirements are met. All vehicles must have at least two fully operative doors with door handles that permit exit and / or entrance from both sides.
A
3.3
 Stock automobile chassis for car body used must be retained. Front to rear frame strengthening members may be added to any unibody, constructed vehicle to connect front and rear sub-frames. If material passes through the floor, the floor must be welded to the member leaving no holes.
MS 4 : BRAKES
A All vehicles in this category must be equipped with four-wheel hydraulic brakes operated by a foot-mounted pedal in the conventional manner. A back-up brake system is mandatory on all vehicles, i.e. handbrake.
MS 5 : BUMPERS
A Bumpers may not be removed. Fibreglass bumpers and lightweight mountings are permitted.
MS 6: COOLING SYSTEM
A A stock-type water pump is required but may be electrically driven. Catch tank/overflow must be securely fitted and completely leak proof. Radiator may be moved forward to permit the installation of longer engine. Anti Freeze is not permitted.
MS 7: DIFFERENTIALS
A Any rear axle assembly and any ratio may be used. Narrowed rear-ends are not acceptable and locked rear-ends are not permitted. (Refer to the Safety Regulations regarding "axle retention"). Front wheel drive cars (as per OEM) may not be converted to rear wheel drive cars and vice versa.
MS 8 : DRIVELINE
A Any driveline with drive shaft loop is allowed.
MS 9 : DRIVE SHAFT LOOP
A 360° front drive shaft loop is highly recommended on all cars running under 13.0 seconds and/or over 160kph. (Refer MSA Drag Racing Rules, Regulations and Specifications).
MS10 : DRIVER AND SAFETY
A For all requirements regarding driver and safety regulations, see the appropriate "General and Safety Regulation" chapters. A full fire retardant suit is highly recommended, including gloves, racing shoes and balaclava. If Methanol is utilised, a full fire retardant suit is mandatory, including gloves, racing shoes and balaclava. (Refer to the Safety Regulations).
MS11 : ELECTRICAL
A Each vehicle in this section must have a full working wiring harness. All lights and charging systems must be fully operational. Starter motor must be retained.
MS12 : ENGINE
A
12.1
 12.1 Only one automotive type engine is allowed.
A
12.2
 12.2 Front mounted engine position must be such that the forward most spark plug does not fall behind the front spindle unless supplied as standard from the manufacturer. Engine swaps are permitted.
MS13 : ENGINE RELOCATION
A Relocation of engine is not permitted, i.e. front engine cars may not be converted to rear engine cars and vice versa. Only one engine is permitted.
MS14 : EXHAUST
A Any exhaust system modification is allowed, i.e. free flow systems and branches with silencer/muffler.
MS15 : FIRE EXTINGUISHERS
A Recommended for all vehicles competing in this category/classes but mandatory for any vehicle running with methanol and/or vehicles running 13.99 or quicker. A minimum of 1kg capacity extinguisher, securely mounted (no tie straps), and within easy reach of the driver when he/she is wearing a safety harness is mandatory. (Refer to Safety Regulations).
MS16 : FIREWALL
A The firewall may not be repositioned but can be modified to cater for distributor or water pipes only.
MS17 : FLOORBOARDS
A
Original floorboards must be retained but may be modified or altered to suit alternative drivelines, but modifications must be of a permanent nature, i.e. welded back into position and/or replacement panel of similar material and thickness as per the original floorboard.
MS18 : FLYWHEELS (Refer to the Safety Regulations)
MS19 : FUEL
A Any fuel complying with general regulations. Methanol is permitted however a methanol indicator must be visible. The use of Nitromethane as fuel or separate injection is strictly prohibited.
MS20 : FUEL SYSTEMS
AA
20.1
 The original fuel tank or an SFI approved fuel cell or a fabricated fuel tank of no less than 25 litres can be used but must be isolated from the driver compartment.
B
20.2
 All fuel tanks must be positioned either in front or behind the driver as per OEM position, i.e. rear mounted engine cars (fuel tank at front side of vehicle) or front mounted engine cars (fuel tank at rear side of vehicle).
C
20.3
 Only SFI approved fuel cells will be allowed to be located in the driver compartment, if the vehicle is of such a nature that the tank cannot be isolated from the driver completely, i.e. hatch-backs, etc, in which case, full protective clothing is mandatory (Refer to the Safety Regulations).
D
20.4
 No pressurised fuel lines are allowed in the driver compartment including mechanical fuel pressure gauges. (Refer to the Safety Regulations).
E
20.5
 When used, fuel cells must have a metal box protecting the part of the fuel cell that is outside of body lines or trunk/boot floor excluding hose connection area in rear.
F
20.6
 Non-metallic fuel cells or tanks must be grounded to frame.
G
20.7
 Cool cans are not permitted.
MS21 : HOOD / BONNET SCOOP
I Permitted with a maximum height of 250mm as measured from the base of the scoop.
MS22 : INSTRUMENTS
I Dashboard and supplementary gauges may be installed at owner's discretion.
MS23 : INTERIOR
I A full interior is required.
MS24 : NITROUS OXIDE:- (Refer to the Safety Regulations)
MS25 : ROLL BARS / ROLL CAGES: (Refer to the Safety Regulations)
MS26 : SAFETY HARNESS:- (Refer to the Safety Regulations)
MS27 : SEATS - DRIVER'S SEAT
I May be relocated forward or backward not more than 100mm from stock location. A minimum of two automotive-type (adult) front seats and/or one bench seat (bakkies) as a minimum is allowed on vehicles with roll cages only.
MS28 : SUSPENSION FRONT
I Full automotive-type front suspension is required. No solid axles allowed. Each point of suspension must be equipped with at least one effective shock absorber with a minimum of 25mm movement in each direction. Excessive cutting or machining of suspension parts is prohibited. Raising or lowering permitted but attention must be taken of minimum ground clearance requirements. A minimum of one hydraulic or pneumatic shock absorber is required per wheel and rear suspension must be operative automobile type.
MS29 : SUSPENSION REAR
I Aftermarket and/or fabricated four-link and/or ladder bar type suspension is not permitted. Back halving is also not allowed.
MS30 : STEERING
I Properly fitted rack and pinion steering may be used in lieu of standard steering.
MS31 : TRACTION BARS: (Refer to the Safety Regulations)
MS32 : TRANSMISSION
I Manual transmissions may be either production or aftermarket assembled but must require the use of a clutch to shift gears. Full automatic and clutched automatic transmissions are acceptable. (Refer to the Safety Regulations).
MS33 : WHEELS AND TYRES
II Any size street tyres are permitted providing they do not protrude more than 50mm outside the fender flare measured at the top of the tyre. Tyres must be street legal and must meet Road Ordinance regulations at the completion of the day's racing, (i.e. not less than 1mm over 100% of area). Only DOT approved tyres with grooves will be permitted. Tyre pressure should be as per manufacturer's recommended pressure guidelines. No re-treaded, re-moulded or re-grooved tyres will be permitted. No racing slicks are allowed. Dot approved tyres with no grooves will be classified as slicks and are not allowed. (Refer to the Safety Regulations).
MS34 : WHEEL BASE
I The wheel base may not be altered.
MS35 : WHEEL TUBS : Not Permitted
MS36 : WHEELIE BARS: Not Permitted
MS37 : WINDSCREENS AND WINDOWS
I These must be in good condition. All windows must be fully operational. All glassware must be stock as fitted by the manufacturer. No Plexiglas will be allowed unless it can be proved that it was originally fitted by the manufacturer.