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extremely unlikely to be too restrictive.

Yes, exactly that, literally without removing the car from the dyno. Ran the car up and it made like... 236 or something, tuner was like "I suspect your exhaust", unbolted it at the mid-pipe and did a pull and it made 250-something.

I'm gonna be a pest and say it's probably too restrictive for 250wkw, from memory those Genomes aren't big mufflers, like.... 2.25" or something. I had a 2.5" Zerosports on mine and it became a limitation over about 230wkw.

For a road car I would just put it on and forget. If you will be going to the track, a dyno check is probably a good idea... won't need a tune I bet, just a safe check... shouldn't cost much more than the dyno bolt up cost.

Figured I should start a proper thread on this for entertainment/Education. So Background, I have competed in a few different motorsports and currently loving the Lemons (Now Nazcar) series. I've got my own team and Car we Race in it, But knowing how amazing it is I wanted to get friends involved and the Perfect car popped up for it. As I'm sure you guessed its a GF wagon, Factory Manual, AWD 1.5L Engine. Interior is in amazing condition while the exterior is what you expect, Also someone threw a rock through the rear window so thats on the Parts replacment list It was used as a paddoc