I found a buyer that is going to pay good money for my Thermal, and I will be upgrading to a dual gate T4 setup next year with a new bottom end, my question is will the 4" hurt my current setup as far as power and responce? I do not know if the 4" is too much for what the car currently is, I dont want to go to the tuner and have him say you should of kept the 3" on.

Neukin EL
GE Sleeded 81.5mm
Wiseco/Crower Pro
Tial 44mm
Tial 50mm
Victor X w/ 70mm TB
2.5" Charge Piping
All Ferrea w/ .5mm Oversize
3" DP
T67 H.O. to a 3" DP
Running E85 as Primary Fuel (500-600 whp all day)

Plan on just welding a 3-4" increaser on the DP for now until its time for a true 4" DP w/ the Topmount.....

 

do u have a .63 hot side now? if so then that turbo isnt big enough to flow for the 4 inch.

 

I dont see it hurting response to your current setup, that turbo provides plenty of backpressure to the engine. Doubt you will see any sig. power gains though.

 

i was using a pt74 on my supra, with a .81 hotside with a full 4 inch all the way back.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by s2kdre &raquo;</TD></TR><TR><TD CLASS="quote">i was using a pt74 on my supra, with a .81 hotside with a full 4 inch all the way back.</TD></TR></TABLE>

this isnt a PT74, irrevelant

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by s2kdre &raquo;</TD></TR><TR><TD CLASS="quote">do u have a .63 hot side now? if so then that turbo isnt big enough to flow for the 4 inch.</TD></TR></TABLE>

.82 P-Trim, using same turbo next year but with T4 housing instead

 

if your around 600whp with that turbo, I would say your pretty close to maxing that 3 inch, it should be safe to go to a 4 inch exhaust.