PPE V8 Headers GS, LS, SC
its not really a problem but i do think they could have done a better job with the flanges to the cat as far as fitment i used all new gaskets but there is a gap between cat and flange because unlike the oem mainifolds there isnt a recessed ring on the header flange so the gasket can seat better.
I'm thinking the same thing. I am just eager to know what type of improvements this will make on my car with Intake, Exhaust, and Apexi Neo tune. Because OP said at first he wasn't happy with the improvements but as time went on the car was adjusting. Did you unplug the negative terminal to the battery to reboot the ECU?
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I'm thinking the same thing. I am just eager to know what type of improvements this will make on my car with Intake, Exhaust, and Apexi Neo tune. Because OP said at first he wasn't happy with the improvements but as time went on the car was adjusting. Did you unplug the negative terminal to the battery to reboot the ECU?
Im not suprised to hear that, low end torque was lost. I had the same thing with my S&S. JBrady & me talked & we were thinking its cause I have Xpipe, instead of the stock Y pipe so yall chime in on if you have a X pipe or Y pipe.
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
With regards to the PPE vs S&S the PPE have slightly larger tubes and a 4 into one collector vs the tri-Y design of the S&S. As I have said before I hope someone will do a direct back to back comparison on both power as well as responsiveness between these designs. Responsiveness on part throttle and low to medium RPM is more important than the last few horsepower at high RPM.
Correct. Until I find a Y pipe or other design superior to the stock I will continue to advise people to keep their stock Y pipe.
With regards to the PPE vs S&S the PPE have slightly larger tubes and a 4 into one collector vs the tri-Y design of the S&S. As I have said before I hope someone will do a direct back to back comparison on both power as well as responsiveness between these designs. Responsiveness on part throttle and low to medium RPM is more important than the last few horsepower at high RPM.
With regards to the PPE vs S&S the PPE have slightly larger tubes and a 4 into one collector vs the tri-Y design of the S&S. As I have said before I hope someone will do a direct back to back comparison on both power as well as responsiveness between these designs. Responsiveness on part throttle and low to medium RPM is more important than the last few horsepower at high RPM.
Lets hope we don't lose to much on the bottom end.
Correct. Until I find a Y pipe or other design superior to the stock I will continue to advise people to keep their stock Y pipe.
With regards to the PPE vs S&S the PPE have slightly larger tubes and a 4 into one collector vs the tri-Y design of the S&S. As I have said before I hope someone will do a direct back to back comparison on both power as well as responsiveness between these designs. Responsiveness on part throttle and low to medium RPM is more important than the last few horsepower at high RPM.
With regards to the PPE vs S&S the PPE have slightly larger tubes and a 4 into one collector vs the tri-Y design of the S&S. As I have said before I hope someone will do a direct back to back comparison on both power as well as responsiveness between these designs. Responsiveness on part throttle and low to medium RPM is more important than the last few horsepower at high RPM.
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Gain in power is not the same as a gain in response. First S&S header install member used a racing 2.25-to-2.5" merge I donated and had a 2.25" Y pipe made. Loss of low end response was very obvious. Felt "mushy". It gained 1rwhp. Removed and went back to stock and car felt snappy again. An SC400 had a custom 2.5"-to-3" Y pipe built using a quality merge pipe from Dr.Gas. Lousy midrange at best. Replaced with 2-to-2.5" Y pipe and car woke way up.
Stock Y has an excellent merge section. Looks restrictive but it is not. Pipes are 50mm (1.97") into a 60mm (2.36") resonator and center pipe. You do not have a center resonator you have a center third catalyst. The GS above tested stock 400 Y-pipe (resonator) against stock 430 Y-pipe (catalyst) and found no power or performance difference. For now, I would not recommend changing your Y pipe.