914 WRX needs Turbo exhaust Engine builder Experts Advice needed, more backpressure/heat in exhaust...what needs to be adjusted? Options

[budman5201]

Okay i have a question out there for the Engine builder or exhaust experts.....

I have a 914 with a WRX 2.0 turbo in it, it flys! I am basically making it into a very streetable quiet car. One of the first things i did during my build is put this aftermarket very shiny equal length chrome header on it and took off the stock heavy cast manifold for more power(never tuned or ran with stock).

I had the engine tuned with this header on it, so its perfectly tuned with it. Now.....I have the stock heavy manifold back on with all the heat reflectors,etc to keep the heat in the manfolds......its is Noticeably quieter than with the equal length, lower to the ground, crappy shiny header and... power seems almost just as great.

So....
New heaver manifold before turbo, smaller diameter exit than aftermarket so more backpressure.....do i need any changes on my fuel map? (i have programmable Link storm ecu.)

(I did get one backfire through exhaust....thats really why i am asking)

[GS Guy]

Hey Budman,

What kind'a muffler are you running? Have any sound clips?

I too want to run a live-ably semi-quite system, so I fitted the biggest muffler that would fit my situation - though it's a Magnaflow, so not quite sure how it's going to sound.
My header is sort of a copy of the factory exhaust layout - short headpipes joining together right out of the head, and both sides connected with a Y section, feeding the turbo after that.
I suspect it will sound a lot like your typical WRX with an aftermarket exhaust/muffler.

Jeff

[budman5201]

Hey Budman,

What kind'a muffler are you running? Have any sound clips?

I too want to run a live-ably semi-quite system, so I fitted the biggest muffler that would fit my situation - though it's a Magnaflow, so not quite sure how it's going to sound.
My header is sort of a copy of the factory exhaust layout - short headpipes joining together right out of the head, and both sides connected with a Y section, feeding the turbo after that.
I suspect it will sound a lot like your typical WRX with an aftermarket exhaust/muffler.

Jeff

so far just an el cheapo Autozone Factory looking muffler. Not even a turbo muffler. Not sure of the brand really. I bet the magnaflow will sound good. I heard those are good at idle and just off idle, and they are LOUD when you lay it down! which might be perfect!