So I’m running my first autocross in 15 years this weekend, and have been in discussion with the local club ( on classing my Boostang. They’re not an SCCA club, but they follow SCCA rules.

Our discussion so far has centered on what mods have been done vs. what I’m planning vs. what the rules say. Honestly I’m not modifying for autocross. I’m modifying for me, and just happen to be doing autocross, so if I’m competitive in class I don’t really care. I just want to have fun and improve my driving. My only real competition is me.

The car is a performance pack Ecoboost Mustang with the upgraded brakes/suspension/tires and so far I have a COBB stage 1 tune with a high flow drop in air filter. Future plans include an upgraded intercooler, full turbo back exhaust with high flow cat and upgraded BOV and waste gate for the turbo. I’m planning on doing the intercooler sometime between now and June, because Texas gets hot and the ecoboost intercooler isn’t quite large enough. That’s actually a problem for the autocross folks...

D Street - This is out since I don’t want to uninstall the tune every time I run, and it precludes doing any other changes. The point was made that only tire and suspension changes make much difference. I’m already running 19x9.5 wheels with 255/40-19 Pirelli P Zero tires. I do want to do a more aggressive lowering spring at some point, and that’s still legal here.

E Street Prepared - This is where I would currently fall with the COBB modifications. This class allows me to change the intercooler, but not the BOV or waste gate.


Street Touring U - No changes are allowed to boost levels, intercoolers, or boost controls. It doesn’t make a lot of sense to me, since a lot of modified WRXs seem to end up in this class.

Street Modified - Engine components are generally unrestricted. No rules restrict boost, intercoolers, or computer tuning.


Classic American Muscle Contemporary - This is a recent class, specifically designed to get musclecar guys who may have been doing autocross with Good Guys Car Shows into regular autocross. Mostly because their regular modifications are incompatible with every other available class. This sounds familiar.

I’m going to have to re-class on Sunday, as currently I’m in STU. I am running as a Novice, but it would be nice in a few months if I can lose that designation and be in a regular class that I’m going to stay in for a while.


Help me OPPO! You’re my only hope! (ok, maybe not)