To modify the plastic chassis and fit gears and alloy wheels does work out to about $90 on top of the $50 or so for the base car, The results can be less that ideal with handling for wood track racing. The Plafit EZ 3400 will fit the small touring cars in many cases.This is usually available for around the $60
Unfortunately the chassis although ready to run has too large a wheels & tyres and the track is too wide for many 1/32 scale touring cars . Also it come with a Plafit pointer motor and 12T :30T gearing. All a bit much for a small touring car . Plafit make a wheel that would be suitable for the small touring cars. Its a pity the chassis is not available without the wheels and motor.
So the motor & pinion is exchanged for one of the control motors for the class. The motor I use is the BWA -NC1 14.6K . This motor is available from DArt Hobbies in Canada. Art is very helpful with a large range of BWA wheels & inserts as well to suit the class. He has also a large range of urethane tyres to suit the Class Link to Art's site - DArt Hobbies Link - DArt Hobbies - Parts Art has a very good postage deal for over $50 of parts as well.
MJK make a very nice 12mm light weight rim with internal grub screw. I used these for the Torana with MJK There are various tyres in the MJK range that will also suit the small tourers.
Urethane is the only material allowed for rear tyres in the small touring car class.
The motor pinion I use is the 10 tooth Purple Plafit . It fits very well onto the BWA shaft. They come in a packet of 4 from ACE Hobbies in Queensland at very low cost. This by using the supplied Plafit orange 30T crown complies with the required 3:1 gear ratio. The Plafit chassis is also available from Werner at Ace. He is the Plafit Agent for Australia so has all the components of the EZ 3400 available . This includes add on weight ballast which attaches with screws.
Link for EZ 3400 parts at ACE Hobbies EZ 3400 Parts