are there any significant differences? design, performance (unlikely)

 

If UK ones then only red paint.
JDM STi ones have no TGV valves, just the divider wall but Spec C manifolds are one piece items that come with a larger diam inlet hose - these are the ones to go for.
See Shauns write up sticky at the top about how good the Spec C inlet hose is.
AS to performance, there is a TGV removal thread on SN and plenty on NASIOC about it.

Nick

 

Thanks Nick, i dontthink ill bother swapping them over to be honest....sounds like a lot of hassle for very little extra.

 

If you change it, give me a shout and I might take your old one for my bugeye.

RR

 

It seems that the TGV delete may have been a bit of a waste of time on my car.
If you are going to try and run at 400 bhp plus then the extra cross-sectional area and potential max. air flow (if useable?), from removing the TGVs & porting may help you though.

if only some proper flow work could be done to show what TGV deletes and inlet porting does/doesn't acheive then we'd be the wiser.

Nick

 

This may help, i went through the same excersise last year!!

http://bbs.scoobynet.co.uk/showthread.php?t=482289