adz556

iTrader: (5)

Morning,

I have a sti newage in let manifold and considering having it ported but not heard anyone else doing this so wondered whether its worth doing or not? Car that's 8 years old and an obvious mod.....if it's not being done there's usually a reason so just wondered?

Thanks! Adam

Henrik

iTrader: (5)

Not a very common mod on imprezas, I'd say.

Reason probably being that the effort/gain ratio means efforts would be better spent elsewhere. However, if you're doing it yourself, I.e free labour, it probably does not hurt to clean it up.

I'm not 100% sure port matching is always a good thing, at least not if you use then gaskets as guides for this, as there's a lot of material to remove then (might be better off blueing the heads and putting the manifolds on to see where you get contact and not)

merlin24

iTrader: (1)

As above, port matching is always a good thing and a few people have tried an Extrude hone/abrasive flow machining but there is always a worry about cleaning the manifold internally afterwards.

Mick

alcazar

iTrader: (2)

The late, great Harvey Smith was the master at this.
His ported manifolds scrolled lower and produced more torque than a stock one.

Have a word with Alyn at AS Performance, he may know.

adz556

iTrader: (5)

I've ordered a Harvey smith ported headers but hadn't heard about his inlet manifolds?

alcazar

iTrader: (2)

Sorry, my bad...I just read "manifold..." which is old boy speak for "headers".

Steve Whitehorn

iTrader: (13)

lol