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Exhaunst manifold vs uppipe

2K views 8 replies 6 participants last post by  Aurora1 
#1 ·
Why does everybody replace just their uppipe when they sell these "exhaust manifolds" with the uppipe included? are they a total waiste of money or something? Seems like uppipes are $150-$250 and a manifold can be had for $450 - $1000
 
#5 ·
I have tried three different headers on my car, and all of them reduced low end and spool time. A magazine not long ago reviewed all of the different ones on the market, and had the same results.

Here's the problem....

The headers are based on a design that was originally made for the JDM STi engine, which has a 9000 rpm redline. None of the headers start making any hp gains until 6500 or so. Which is fine with a 9000 rpm redline. But, with the 7000 rpm redline, we see little or no gains, and lose on the low end. I have installed headers on at least 4 different cars, and all have gone back to the stock manifold within a few months.

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