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Several group buys going on at Apex right now...

Same here... until I put the headers on

The headers made the biggest, most noticeable difference when my car was NA. I'm talking like the difference you get by going to a 3.46 in the rear.
I think it let all the other mods finally breathe

I noticed no difference whatsoever. Same after I supercharged it. AJ at ESS Tuning said it would add maybe 5 HP with the supercharger...

There were some on e46f FI forum experimenting with...

Apparently, there is a lot of interest in this:



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