Exhaust Manifold

[newboost]

Just noticed that i have 2 broken exhaust manifold studs. While i have the manifold off i was looking at getting it ported for better flow rather than getting a cheap stainless manifold.

would this be of any gains or a waiste of my time.

mods so far

splitfire coils

fmic

ebc

hyflowed turbo

bosch intank pump

turbo back exhaust

haltech ecu

any thoughts would be of help

[kitto]

I'd say that the cost of porting will out-weigh the gains.

If you want a good manifold, the only one you should go for would be a steam pipe manifold that wont ever crack.

[AngryRB]

The stock manifold is good for 300kw apparently, one thing you should do is get it faced, cause it will most likely be warped.

Also you could ceramic coat it i like did, might make a difference i hope.

another thing, replace all of the bolts, even the non broken ones with high quality bolts, no cheap stuff

Edited May 7, 2012 by SliverS2

[wolverine]

You can tidy it up with a die grinder and blend out any imperfections while it is off.

If you have the time and patience....why not.

[WARLORD]

seen stock manifold make just under 350 rwkw on sau with dyno

[Bsa]

I think it would be a waste of money but as Andy said can be cleaned up but they are fairly good I only clean them when I make them external gate

[GTScotT]

+1 vote for waste of time

When you need something better than the stock manifold you should just get a highmount.

[The Mafia]

get a die grinder, and take off any hard edges, curves, or castings.

I did it with mine. Apparently, when sending your manifold away for flowing, 80% of the flow is achieved with the die grinder, and the other 20% is achieved with extrusion honing.

You can get similar flow to a Low mount HKS cast manifold if you and grind good and do it properly.

Oh, and definitely get it faced.

Edited May 8, 2012 by The Mafia