Which header is the best for an OBDI GS-R with an all-motor setup. Mods already included are powercore race cat, aem cai, apex-i ws exhaust, and b&m short shifter?

 

JDM 4-1

 

I agree.

 

I disagree. JDM 4-1 is a major bottle neck if you plan on getting serious with n/a power.

 

It all depends upon your ultimate goal...a header for a 2.0L engine wont work all that well for a 1.8L, and a header designed to run up to 9,500rpm doesn't do all that well at 4,000rpm...I choose HyTech.

Austin

 

Mild power, get a jdm type r 4-1
Lots of power, get a hytech or smsp

 

Is a 4-1 better for N/A or a 4-2-1. What is the advantages?

 

4-2-1 gives you more midrange. 4-1 gives you top end. Think about it, when you race, you are at high rpms, shifting at high rpms, and staying at higher rpm levels more, so it would be more beneficial to get a 4-1 header.

 

jdm

 

Go with TODA

 

I already see problems with going JDM 4-1. 2.5" collector with a 60mm exhaust. Do you want to step down the exhaust system as you get farther away from the engine? Definetly not.

 

spoon.....hahahha

 

 

For a mild build up, jdm dc 4 to 1. For higher displacement, cams, etc., hytech.

 

Wheres the step down???? Its called a 2.5" collector but is in fact only 60.5mm (2.38") so theres no step down from collector to exhaust.

OE JDM 4-1 or DC JDM 4-1

 

SMSP, Hytech, Toda

 

Why do you guys still answer these types of threads? There has to be at least 500 which is the best header threads. Tell this noob to do a search.

 

How aggressive do you think your setup will be, cam-wise?
How often do you think youll track it?

 

my question is, how much are you willing to spend?

 

as long as the money is worth it i'llget it. my car is mostly a street driven car. only sees the track like once every two months. also when you mean jdm do u mean the oem gsr header or what.

 

where can you buy SMSP or Hytech headers? i can't seem to find them.

 

you have to custom order them, do a search for contact info.

 

The only exhaust component that is measured ID, is catalytic converters.

Which means a 60mm exhaust is measured OD, so it is not 2.38" to match the 2.5" collector. There is a step down.

 

runnin comptech race headers on my all motor gsr and i love it, it's a 4-2-1 with 2.5 in collector. got the header and the test pipe installed for 1000, pretty decent price for great power. that's my .02 cents

 

yeah.

I believe there was a huge Header Comparison on the internet, but the site took it down. They tested tons of headers and Toda put out the most HP. I dont think they tested HyTech or SMSP tho.

How much does a HyTech header cost? I've never seen online pricing for them. The Toda is like about 900 bux or something.