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Old 30 June 2009, 07:58 PM
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chris_bobuk
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Default Max power from 2.5" exhaust

As above, whats the max power from a 2.5" exhaust.
Sports cat, straight through center section and sport backbox.
Old 01 July 2009, 01:23 AM
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chris_bobuk
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Anyone?

Just checked its 3" to the center section then 2.5" back over
Old 01 July 2009, 05:50 AM
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71/200
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Andy Forrest,s road car 02 STI RA is said to running a 2.5in system. His is 450bhp+
Old 01 July 2009, 05:59 AM
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chris_bobuk
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I had a feeling it did as I had the mag with his car in, just can't place my hands on it.

If it can take it I'll start saving for a new turbo, intercooler and headers.
Old 01 July 2009, 06:43 AM
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chrisdicko
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Mine is fully de-catted.

Has a 3" down pipe, to 2.5" centre, back to a 3" back box, and I'm running 432/375.
Old 01 July 2009, 03:08 PM
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Henrik
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mine's 391/392 and 3" H&S downpipe to 2.5" and then 2.5" all the way through. I have a scoobyworld resonated centre section and a PPP backbox.


Edit: fully decatted
Old 01 July 2009, 03:55 PM
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bluerigster
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A 2.5" exhaust is supposedly restrictive on an engines breathing once you reach 350 bhp, that's not to say that there are many subaru's running >350 bhp with a 2.5" exhaust system fitted.
Old 01 July 2009, 06:26 PM
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chris_bobuk
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well as long as I can hit 380 ish on it I will be happy.
Saves me spending yet more money on the exhaust.
Old 01 July 2009, 07:46 PM
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chrisdicko
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Will easily make it mate. The exhaust won't be the limiting factor.
Old 01 July 2009, 07:51 PM
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chris_bobuk
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No it wont.
I don't think I'm going to the same extreme as you on the modding front!
Have you fitted your KS-3 yet?
If so what settings you running to give me an idea where to start when I set mine up.
Old 01 July 2009, 08:08 PM
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TingTongPJ
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my 2.5" exhaust was the limiting factor on my98 i had a bell mouth downpipe going to 2.5" then back to 3" at the back.
i only reached 382 bhp on the rollers with it.
if you want to see my spec look in my garage.
Old 01 July 2009, 08:19 PM
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_Meridian_
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Originally Posted by chris_bobuk
Anyone?

Just checked its 3" to the center section then 2.5" back over



I've seen a blob hit 382 on the Zen rollers with a standard factory PPP kit. You've done the important part (the down-pipe) so 400 ought to be possible.


M
Old 01 July 2009, 08:27 PM
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chris_bobuk
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Thats ok then.
I didn't really want to fork out for another exhaust.
I did say I wouldn't mod this that much but after having a bit more power I would like the high 300's no more as its a daily driver.
Old 01 July 2009, 08:34 PM
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chrisdicko
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Mines a daily driver to

Yeah i've fitted my KS-3 mate. It's not fully set up, but I will try to do it tomorrow and let you know. I mounted the sensor on the inlet manifold.
Old 01 July 2009, 08:46 PM
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chris_bobuk
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Manifold was where I was going to fasten it, may move it when the intercooler is next off though.
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