4SFEDZ

iTrader: (6)

ok how much would i benefit with a cutout right after the down pipe? my exhaust is 3.5 all the way just barely over the axle with a 3.5 spiral flow. would it be worth puttin a cut out right after the dp? if so how much?

HUNTER02SS

iTrader: (24)

You would benefit greatly! Just make sure that when you open the cutout that you have your A/F checked. I had a manual boost gauge and I was set at 12lbs and when we opened the dumps it went to 18lbs. needles to say I had to add fuel to it. Little to no backpressure will spool quicker also.

TAwhore

no back pressure is your friend when it comes to turbos, in fact go to qtp's web site, they have results of cut out dp's vs. full exhaust on other cars (wrx, srt 4 , ect.)

Websy21

iTrader: (34)

Yup I agree, this is why I ordered a 3.5'' elec cutout for my setup coming soon even though it will have a 4'' exhaust I am convinced it will work wonders. I will tune it with it opened and most likely have it open at most times but only when I want to be steath...................... cops, lol

4SFEDZ

iTrader: (6)

so i should tune it with it open then when i close it the boost will drop a lil and it will run a lil richer correct?

Dragframe

iTrader: (14)

yes...

But you have a pretty free flowing exhaust by the sounds of it... not sure what the actual gains would really be.

4SFEDZ

iTrader: (6)

my setup is a lt1 filled with, cola 4340 forged 3.75" stroke crank, Eagle H-beam rods, JE .040 over pistons, 4 bolt splayed billet mains, LPE cnc heads that have been reworked by Yelvi, flow around 275 on the intake and 218 on the exhaust (LT1 castings). Also has head studs, cometic gaskets, Crower hydraulic lifters with the block modified to use them, had to mill the lifter bores slightly, 76mm turbo, kit is simular to the tti but most the problems fixed, huge intercooler with 3" piping, 3.5 dp and 3.5 all the way back with a spiral flow, or bullet (have one of each this is my delima), its a 6 speed, with a mcleod twin, s60 with 3.50 full spool, it just has a street tune on it now making bout 5-6 psi and spining my 335 nittos till bout 65mph. not sure on the power but it sure feels good!

Websy21

iTrader: (34)

You might be ok with that exhaust however I will have a 3'' downpipe so it will benefit me greatly. Its worth a try though, cheap and I am sure it will make some more power. Every little bit helps and should spool abit faster too.

engineermike

I was set at 20 psi and removed my muffler. The boost went to ??? 2 blown head gaskets and a hydraulic locked motor. BE CAREFUL!

Mike

Websy21

iTrader: (34)

That sucks but someone has to learn the hardway for us!

That answer's your question there if its worth it or not............... um ya but be careful!