Stainless Exhaust Manifold

[jimako87]

probably a stupid question

i was looking at a HPI Stainless Exhaust Manifold (low mount) for my R32 RB20 and was wondering if it does anything to my performace or sound of the engine??

or is this simply an autosalon mod

[jivlah]

it will change the exhaust note, not sure if u will notice that much, and should increase power output.

[R31Nismoid]

On a stocker car/turbo

mainly autosalon mod

[GTR-32U]

personally.... I dont like them...sure they look good, but they do not contain the heat in like a cast manifold will. Some say the more efficient design brings on boost earlier. yet others say that due to the manifold losing so much heat there is less of it their to aid in exhaust gas velocity...So who knows !... On a GTR they would be a waste of money ...but on a GTST.....?

[Travo]

I was reading in a huge forum post about these..

apparently the HPI exhaust manifolds do have a performance increase.

http://www.skylinesaustralia.com/forums/Ma...l&hl=6boost

[R34GTFOUR]

personally for a low mount setup i would just use the cast manifold, if you want to go a bit crazy get it honed and cleaned up then ceramic coat it. Low mount s/s setups are reknown for cracking

If you want anymore than that, just go a highmount with a bigger turbo

[joeyjoejoejuniorshabadoo]

Low mount s/s setups are reknown for cracking

isn't that cause most are cheap china ones tho?

[R34GTFOUR]

isn't that cause most are cheap china ones tho?

yeah its is, but something that cramped, with such big bends in a small place i wouldnt trust under the sort of heat a manifold reaches, especially being stainless

[joeyjoejoejuniorshabadoo]

yeah... i thought about doing it while the new turbo is going in... but have heard too many bad results...

& i didn't buy a 2835 to highmount

[R34GTFOUR]

haha, yeah you wouldnt want to high mount the stock turbo = ghey

i would just clean up the stock manifold, its not going to look as pretty as a golden s/s setup, but atleast you wont be taking the turbo off in 12months time to replace a cracked manifold

[Travis Trayhern]

what about heat wraping the s/s manifold dose this make it worse or better with the crackin

[bryyy]

Cracking has ALOT to do with the way your exhaust is mounted. ie flex pipes, how much movement there is in the mounts etc.

[R31Nismoid]

HR31 GTS-R low-mount manifold, 20 years old, stainless... no cracks.

Its all in the design, quality of material and how everything is mounted

[Sydneykid]

yeah its is, but something that cramped, with such big bends in a small place i wouldnt trust under the sort of heat a manifold reaches, especially being stainless

My GTR-S low mount was far less cramped than the current top mount. Plus it was in the main air stream going out of the under bonnet area and flowing down beside the engine and gearbox. The pipework ran much cooler than the current top mount, which has very little, if any, airflow past it.

Cheers

Gary

[joeyjoejoejuniorshabadoo]

haha, yeah you wouldnt want to high mount the stock turbo = ghey

hehehe... ghey x 11ty even!

i meant however that i bought a 2835 specifiaclly to have it low mounted