monkeyfish76

iTrader: (3)

Without a tune u will run super rich. I ran a test pipe with stock exhaust for a few months and didnt notice any huge power gains. Installed a full catback and had it dyno tuned at modified by kc. 335 awhp & 323tq with only mods being catback and test pipe.

marc-111

you would just haina few hp if you runa test pipe with a stock exhaust.....it's better to change to full exhaust to notice the hp increase

edogg23

iTrader: (2)

Isn't the largest restriction in the stock exhaust the cat?

Noize

iTrader: (24)

Yes, it is by far the biggest restriction. There is a ton of misinformation in this thread.

Evo IX same tuner pre and post, I had a friend make 12whp with just the addition of an Ultimate Racing test pipe. Lots cooler EGTs as well.

Same thing with an Evo X, put a turbo-back on it and tune both ways with a HFC, you'll make 12-15whp more with a test pipe. The restriction is the worst at high rpm.

Maverickvf84

Bro get a TBE!!!Just save up and get the whole thing!Last year I got the UR Cat-back exhaust then just 2days ago I got the last UR resonated testpipe!along with my AMS DP the this TBE is gr8!!!Large power gain...but I couldnt dyno/tune becuz this other guy was abotu 2do a E85 tune and i wasnt about to sit there all afternoon...ill go back another day to find out my numbers now but I can surely feel the gains + the fluttering i was gettin from my wastegate becuz of my 3-port boost solenoid went away!

Save up and do it at once...a testpipe + a stock exhaust that was proven 2b super restrictive seems like a waste of time 2me...but thas just me...

YShen15118

Drew,

check out the Magnaflow catback for the Evo X. It looks almost identical to stock. And it's cheap too.

freethriftyz

I did this, it made a nasty sound at WOT sometimes tho. Super stealth, that + intake, uicp, 3 port got me 402wtq

X Evolution X

Nor sure this is correct, chances are if you go with a down pipe and best pipe, you will experience some over boosting and creating knock.

I personally wouldn't want that for my car, so I went with catback for now until I am good and ready for a tune.

b3n

I ran a TP and O2 DP with the rest of the exhaust being stock for a stealthy look...with Cobb's stage 2 tune, the gains were good. Prepare yourself for the smell though...

Alpha X

iTrader: (9)

Tell us how you really feel about those that run test pipes

CaptainAsia

Can you run a stage 2 on the AP with just a hfc or tp on a stock exhaust? I went to a shop and they said it would create a lot of back pressure or something like that aka not good...