Gtr Twin Turbo Exhaust Manifolds

[SRB]

on behalf of a friend with a gtr..

came across some gtr manifolds with following specifics

SU321 stainless steel, Fully TIG welded, Fully Ported and Polished.

how would they compare say to the usual SU304 manifolds found, eg tuneagent/racespec..

thanks

su321

su304

[SteveL]

In terms of the materials used (321 vs 304) there will be no performance benefit. Any performance gains will be down to the design and quality of construction.

[pnblight]

on behalf of a friend with a gtr..

came across some gtr manifolds with following specifics

SU321 stainless steel, Fully TIG welded, Fully Ported and Polished.

how would they compare say to the usual SU304 manifolds found, eg tuneagent/racespec..

thanks

su321

su304

<{POST_SNAPBACK}>

Personally neither of these manifolds match up to the hks manifolds as i bought a set and found the port oversize and didn’t line up properly and the turbo flange was way to big and i had to get a different gasket just get them to seal up even after i had them surface ground. So if you can find some second hand hks manifold they are worth every scent.

If you can not afford hks unit i would look at the extrusion porting of the std manifolds.

Pete

[R31Nismoid]

numbers being different would probably mean a different grade of stainless.

google it maybe? try find out what grades have what properties

[SRB]

by looking at those two, which would u choose and y??

[R31Nismoid]

did you read petes post?

i dont think it gets any clearer than that

[SRB]

ye but did he buy the same ones in question, from RACESPEC.. ive read many posts from others saying they were very happy with their product, so thats my dilemma.

[Wazz]

321 is marine grade stainless from memory

304 is alot better with the differences in heat changing constantly 321 tends to go brittle and cracks quicker than 304 (from memory.. could be other way around its been awhile since i got taught all that stuff)

other than the the performance difference would depend on the insides weather there the same or different

Edited January 11, 2006 by Wazz

[SteveL]

321 is marine grade stainless from memory

304 is alot better with the differences in heat changing constantly 321 tends to go brittle and cracks quicker than 304 (from memory.. could be other way around its been awhile since i got taught all that stuff)

<{POST_SNAPBACK}>

None of the above.

[Wazz]

meh wat ever its been ages since i did all that stuff

[SRB]

hahaha ^^^^^ i kno 321 is a higher quality stainless steel, but i dont think there are any performance gains to be made. i hope these tuneagent/racespec manifolds are up to scratch!