[W///]

Originally Posted by KmndntKlink

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

It depends on the X-pipe, there's so many options. For example, Challenge:
Sport = high flow cats + resonators
Race = Resonators
Race + = absolutely nothing.

I think that's how it goes. Test pipes only delete the primaries (which is where you'll gain the most HP). I had test pipes + OEM secondaries & resonators = no smell.

The most important part in terms of sound will be what axle back you go with. Don't do test pipes + oem mod. Very loud, raspy and it drones.

Out of those combos, I'd recommend going test pipes + Dinan for sure, trust me. I've gone through like 8 exhaust combos before I found my perfect one.