Whats the best pulley setup out there. I imagine the power to be gained should be about the same on all the sets, but whats a good quality unit at a good price and where did you buy it?
Also wondering what it costs to put them in, or are they a DIY?
Thanks
Skyler

I see the euro cats and these other aftermarket midpipes w/ cats that are so expensive. What would be wrong with using a quality hi-flow catalytic converter say a car sound. These are about $75 each, much cheaper. Couldnt a a muffler shop put them in and get about the same gain in performance?

Also how much labor is involved in euro headers install?

Thanks

No real experience to back this, but I'd guess that w/ all the sensors and computers in an M3 that something that wasn't designed to fit into the HIGHLY tuned exhaust might cause engine lights, and even hurt performance.

Pure conjecture though.

Ive thought about that too, but it seems like a quality hi flow cat of similar specs in the same location would work fine. Id lov eto know if anyone knows more about this, or maybe Id have to try it. Itd be nice to save $1000.