I'm preparing to do a complete front suspension swapout on my 2003 Mustang Mach 1 including tubular K-member, tubular A-arms and Eibach coilovers. While the K-member is off the car, I'm also going to do a complete exhaust swap with long tube headers, catted X-pipe, and Flowmasters.
My question is finding the Solo class the car will be in with the suspension changes. Having read the 2017 rules, I think I'm all the way down in Street Modified, but that seems extreme for what I'm doing with the car.
Street Prepared seems like where I should be in spirit, but it has some weird hangups. 2-point strut tower bars may be added, and sub-frame connectors can be added (Mach 1 already has SFCs), both of which increase chassis rigidity. But changes to the any subframes (you consider the K-member a subframe, right?) are for mounting purposes or strengthening (durability) only. Additional connections, etc. (adding rigidity) are not allowed. Losing weight is pretty strictly prohibited.
My purpose for doing the mods is to strengthen the chassis and suspension components and introduce rigidity to the notoriously flexible Mustang platform. And also to make working in the engine bay easier. I intend to keep the stock geometry by using a K-member which specifically claims to do so, and by using stock-replacement tubular A-arms, along with caster-camber plates and a bump-steer kit to regain stock caster/camber/alignment settings. This should satisfy the intent of the rules.
The problem is going to stronger tubular parts usually gains you strength but also loses weight, which is, again, prohibited by the Street Prepared rules. The loss in weight as best I can surmise before doing it is in the range of 20 or 30 lbs, which I cannot see as a performance-increasing amount. The biggest performance increase would come from the increased front-end rigidity and the improved wheel-rates and damping from the allowed aftermarket coilovers.
This car will stay a daily driver. I'm not making a non-streetable autocross-only monster. I'm not doing engine upgrades or power adders beyond what little is gained with the exhaust swap. I want to stay in a category where there's more competition and I'm not getting my rear-end handed to my by race-prepped track cars.
What say you all? Thanks in advance for your help.