What's the difference between test pipes & xpipes in terms of cats, power, smell & sound?
Are test pipes headers back (ie deletes all the cats?) From what I understand HFC gets you most of the power with no smell, which I think is great for daily drivers
I'd like to get the extra power but I don't want it to smell or drone or be race loud, so I was thinking a challenge xpipe and a dinan or OEM mod rear. It also has to be bolt-on & easy to go back to stock.
I hear test pipes require cutting stuff & so does the challenge street xpipe.
any experts care to chime in? TIYA
E92 ///M3 in Dakar Yellow, M-DCT, iDrive, 220M OEM rims, Active Autowerke Green filter, Turner Motorsport test pipes, BPM stage 2 tune, Stoptech ST-40 F+R in yellow.