neil-h

Well it turns out my GB270 has a hole in the exhaust manifold. So what do people recommend as a replacement? Also is it worth having it heat wrapped?

Scoobyworld have the afterburner manifold on offer at the moment for £315, so that's tempting. Either that or something with the Harvey up pipe.

Cheers

Steve's Sti

iTrader: (2)

depends on power standard ported headers work best up to 400 then after gt spec ones are best suited

neil-h

Silly question but what's the difference (although I'm unlikely to go over 400bhp)?

Steve's Sti

iTrader: (2)

im sure its all to do with the flow but i ran my standard headers to 400hp no worries, then went for gt spec but i tried to retain standard ones as mapper said you get better results with standard ones. if your just after the standard headers ive a set for sale but if want aftermarket ones avoid any with flexi joints

adz556

iTrader: (5)

If you go to tubular headers too early (ie. turbo too small to push enough air through the larger volume quick enough) your set up gets more lag. I took my standard headers off to fit my ported ones so I have a set of standards spare in good condition going cheap. Pm me if interested.

Adam

neil-h

Would I need a remap with the Harvey up pipe/headers? Iirc the hawk doesn't have the cat in the up pipe, so presumably the difference in exhaust flow isn't as great?

Steve's Sti

iTrader: (2)

my standard up-pipe flowed well and spooled well on standard headers to 400hp, i then changed to GT spec 3 bolts with harvey smith up pipe and lost bit of spool as it pulled the torque a bit further up the rev range horses for courses