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burnyd
09-03-2012, 02:24 AM
Anyone know off hand how much power the stock exhaust manifold is good for?

MrWOT
09-03-2012, 04:58 AM
I have yet to see anyone outflow the stock manifold. It can use a little cleanup, but it's not a bottleneck.

burnyd
09-03-2012, 05:03 AM
No I agree to that. Looking for a little more top end power if need be. Looks like I have a leak through either the exhaust manifold gasket or the gasket from the exhaust manifold to the turbo. Being that its a bit of a pain to remove it in my mr2 I figured I could pick up a aftermarket exhaust manifold for my 20g setup.

MrWOT
09-03-2012, 07:01 AM
List your whole setup?

burnyd
09-03-2012, 04:55 PM
TD06-20g, downpipe catless 3" exhaust, 264 cams, adjustable ats cam gears,supra 550s bored fuel rail, walbro 250, Greddy side mount intercooler. If I could squeeze some more top end out of a after market exhaust manifold it would be great Ive never ran one on a 3sgte before.

ChrisD
09-03-2012, 06:53 PM
Not a "bottleneck" per se, but a well designed manifold can net you some power or area under the torque curve. At your power levels an intake manifold will probably net you more gains than an exhaust manifold.

The key is that it is well designed for your set up. e.g. a generic ebay manifold probably won't gain you much.

MrWOT
09-03-2012, 08:09 PM
Intake manifold and IC would be the upgrade path of choice imho. Exhaust manifold only when you can afford a well fabbed one and a downpipe to match.

edit: I find that the downpipe is a REALLY important part of a turbo powerplant. Keeping the turbulance down OUT of the turbine is key.

vip09
09-08-2012, 06:11 PM
I would go with a side mount intake manifold and an a/w ic setup or large a/a core in the left side of the bay like the ATS setup before I worried about an exhaust manifold.

Mafix
09-10-2012, 05:51 PM
IC would be the upgrade path of choice

this.

Luni
09-10-2012, 10:33 PM
Ive seen properly designed turbo manifolds net 50-60whp on the right setup. The stock manifold is good, but there are definitely better out there. But the price break is alot. Youre looking at ~1k for a good manifold.

JDM SNUKUMZ
09-13-2012, 08:19 PM
Bottleneck at 550whp.

I took the stock gen 2 manifold to 710 whp but by 550 it was showing that it just wasnt making power.....

Angel