Headers
 

Following on from Cooj and the boys talking about headers to suit the 2.5 OZ motors.
BT Revoultion are selling GT spec headers at a reasonable price over East.
Obviously if you are going down this track you would want to either Jet coat or wrap.
2 Questions in regards to an 06 sti:
Will there be much benefit fitted in conjunction with zorst, intake, FMI and [B]max[/B] 18 psi boost and retune?
How problematic are these things in regards to cracking etc - Pete seems to have had some problems....
When this thing of mine finally gets done, it is only going to the shop once to be fitted for parts and once for a tune so I do not want to be going back and forwards all the time.....

If your only running 18psi, I wouldnt bother... The gain will be negligiable power wise, depending on how they are designed you will at least getter slightly better response.

I would recommend just getting an up-pipe and TBE system exhaust wise. Combined with the intake and FMIC and retune, it should give you some pretty good results. Should be an easy 200kw atw with those mods... might want to consider a bigger fuel pump though.



EDIT: WOOOOT!!!! 500 Posts!!!!

yer i have been told by many that the headers wont do much before 200-220@the wheel kilowatts... but as i am not to sure bout the 06's after reading that thread on westnet.. but after having headers on my car i can say u loose alotta down low power makes the car harder to drive... but when your on boost it definitely just pulls hard to redliine!

thanks
mark

Just modify the stockers if anything Al.

Jump onto rexnet and do a seach for that CR 97 Rexy dude... he tested some tomei headers and as a result - made his car slower. Now before I get flamed by all of the warriors, just have a read of his thread.

He did 15 passes at the drags, had his motec retuned etc - the car ran consistantly slower ETs and terminals.

Thats enough evidence for me NOT to buy them.

pete had issues with the xforce headers cracking. stace has had his xforce headers rewelded and hasnt had any issues since.

what are your plans for the future?

Yeah I'm thinking I dun need em as well. Will not be going for a bigger huffer as I reckon withe the mods I am thinking of this thing should spool up very nicely without any lag. Jays car sounds like more than enough for me I think!
I was originally thinking around 250-270 ps would be heaps so if I get more than that with plenty of safety margin (max 18psi and 11:1 afrs I would be very happy)
ATM I am going zorst, CAI, silicon intake, FMI (for the bling and a bit of safety) and tune.
AL

Get your stock cast manifold ported and ceramic coated in and out, aftermarket cross-pipe, and port your stock up-pipe. Should be more than enough :)

whats this farken cross pipe you crack smokin whores are on about?
When you say port, port match headers to heads yeah? so no lip or edge bewteen the 2 ?
Al

Port match means exactly that...ensuring a smooth transition between the heads and the separate parts of the manifold.

The manifold is actually made of 4 parts.

If you look underneath your car (with the undertray removed), you'll see a cast section coming off each cylinder head (2 sections)

The drivers side section has an up-pipe attached (the 3rd section), and in between the two heads, is a pipe that goes in between and joins the two cast sections together (the 4th section), known as the cross pipe. This pipe is only about 32mm in diameter, and is a restriction. Gains have been found by getting a stainless one made up in a slightly larger diameter, or buying a premade one (such as the Injen cross pipe, but its damn expensive, around 5-600 bucks)

It might also be worth looking at extrude honing the cast parts of the manifold..

this is the larger cross pipe i had hade made up

stock is 32mm - this one is 44mm, dont go any bigger coz u will get more lag.

the stock cross pipe is the ONLY restriction on the stock headers

[img]http://img98.imageshack.us/img98/374/dsc00156hk4.jpg[/img]