http://www.japspeed.co.uk/Subaru-Imp...3/p-24-72-990/

Any one running this? be interested to get some feedback!

 

I run the spec 2.. one of the large 22mm nuts wound itself loose, so make sure you loctite it (its in the 4 into 1 section). Other then that, good fit, and work well!

 

nice one cheers mate!

Any one else got any views on these?

How restrictive are the standard Headers?

 

Standard headers arnt to bad. Good up to around 400hp. The japspeed ones are said to be not to good. Id suggest doing a search

 

Im looking to run 350bhp on a WRX with a TD05 18g, so I can keep the std headers and maybe just get a Harvey Up-pipe?

 

I read this alot, but are there any gains to an aftermarket header and up-pipe upgrade coupled with a remap or is it purely a modification to compliment a bigger turbo etc?

Edit: For example, if you had a 300bhp STi with standard Turbo, would you stand to gain anything from headers/up-pipe and remap?

 

ported headers and custom up-pipe would certainly assist - majority of aftermarket headers and particuarly the up-pipes are far too large for std style turbo's IMO

 

I'm planning on going ported headers + HS Up-pipe within the next couple of months; along with a decat turbo-back and remap.

I'm not expecting too many gains, but it's all ground work for a larger turbo later in the year/early next year with potentially a FMIC.

It seems from reading, that despite changing exhaust, intercooler, headers and up-pipe - only the Turbo is actually giving significant gains, and the rest is all just "support equipment".

If I keep all the "support equipment" standard and just bolt on a turbo good for 380bhp, and make 380bhp on the dyno - would I gain more with the same turbo plus headers, up-pipe, intercooler, exhaust or will I make the same power, just with a better driving experience (less lag, etc)?

Sorry for the thread hijack!

 

No worries on the Thread Hijack mate , as I'm learning and taken it all in as well as I would like to know!

 

As above. I fitted a set of headers in my early days of ownership to a mapped car with a standard turbo. Had the map tweeked and lost power and spool as the up-pipe was to bigger bore.

 

I'm running japspeed headers and de cat down pipe, fit was not great but got them on.
I ported them aswell.
Massive gain in torque over standard headers.
Big d ported my vf35 aswell.
Here is my graph from lat sat.
Before map was standard car at chritmas with a re map.
Cheers Chris

 

Before and after over lapped