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Message: <blockquote data-quote="Warhorse Racing" data-source="post: 1456154" data-attributes="member: 23098">Ever since the IRS was put into the 99-04 Cobras, there has been a debate about whether or not it's better than a Solid Rear Axle with the common mods (Panhard Bar, Torque Arm, Watt's Link). In my experience, the IRS puts the limit further out than those other mods. If you run on courses with lots of sweepers and slaloms, a well-built IRS will be best. And, because it adds about 100 lbs. to the rear end of the car, it helps with the weight distribution. My V6 IRS car is nearly at 50/50 and it is much more nimble than my 2000 GT IRS car. But, I run with many people who have fast, competitive SRA cars. I don't want to give the impression that you NEED an IRS to autocross. I loved running my SRA cars (and I'll be running one a few times in 2020).As for rims, you are going to want as much rubber as possible on the car. My New Edge cars run a 315 square setup, and that really helps with grip. But, a lot of people I know run 275s on 18x10 rims. You should absolutely run that V6 in CAM-T. I can't wait to see what mine can do when I get the weight out of it!</blockquote>