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Old 08-19-2003, 06:46 AM   #51
happasaiyan
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Default Re: Dyno Sheets Found...

Quote:
Originally posted by Janq
Makes me wonder what might happen with the addition of the TXS turboback system ($730) and the stock STi muffler (to keep things quiet & street legal)...
you mean the stealth back? anyhoo, i have the greddy evo exhaust which is quiet, but mean. this is probably only good for maybe 5whp up top, but its quiet enough for me, and sounds awesome, so it gets my vote. plus its not too obvious, as the huge canister sits above the tip. doesnt attract too much attention, and im sure most people without the keen eye will think its still stock.
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Old 08-19-2003, 11:34 AM   #52
Janq
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Yep...my fault; 'Stealth Back'.
I'll go back and make an edit.

Why do the Greddy EVO exhaust if it only add 5HP?
Does it not increase Tq through the usable normal range?

I won't be racing so a top range gain does me now good IRL.
Its good though that the sound is muted which is a necessity in my neighborhood.

Thanks for the correction!

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Old 08-19-2003, 11:51 AM   #53
MTMS4
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Default

Hey Janq,

I think the biggest gains come from changing to a catless downpipe (like the 4" Godspeed DP).........but obviously this is illegal for road use, though many people do it.

I think with the stock DP and a 3" cat-back exhaust, you're probably only looking at 10-15 hp increase (at a guess). The other thing to consider is that the larger diameter exhausts very often (not always) increase power at higher RPMs at the expense of some low-end torque, so for day-to-day driveability this may not be what you're after.

I'm going to see what Prodrive eventually offer in terms of exhaust/muffler with their 400 hp kit.....at least it should be reasonably quiet. I'd really like to fit a JDM all-titanium sytem (e.g. Cusco DP with hi-flow cat mated to a JIC or Fujisubo exhaust) for weight savings and performance gain.......but these are pretty expensive and may not be worth it on a bang-per-buck basis.
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Old 08-19-2003, 01:08 PM   #54
bairy
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is the Prodrive kit going to be an option for dealer installed by some dealers? I guess the UK does this and all parts are covered under factory warranty.
I would love to have a 400hp PPP dealer installed kit.
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Old 08-19-2003, 01:15 PM   #55
Janq
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I'm too am patiently awaiting Prodrive as that is my preferred choice for Subie mods. But I also want to do my due dilligence and be aware of the 'alternatives' that are out there.
Thats where last nights review comes in. I have a lot more to do though.

Many of you guys have a lead on me as you were and/or are current Impreza/WRX owners and are already familiar with these various exhaust mods & manufacturers. The STi is my first Impreza as I've always been a Legacy/SVX/Loyale & GL man.

Thanks for the feedback & info guys!
Keep'em coming...

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Old 08-19-2003, 01:18 PM   #56
Janq
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Quote:
Originally posted by bairy
is the Prodrive kit going to be an option for dealer installed by some dealers? I guess the UK does this and all parts are covered under factory warranty.
I would love to have a 400hp PPP dealer installed kit.
Nope, thats only overseas.
Subaru has already said that they will nto recognize Prodrive mods nor warranty them as in England on the 2.0L.


Now you might be able to find a dealer somewhere (i.e. Mastro in FLA) that will assist/support your desires, but thats on a case by case basis.

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Old 08-19-2003, 01:40 PM   #57
dlowman
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I am taking a different route. Turboxs stealth back exhaust with high flow cat. I am not going to loose all that much performance going that way. Also I am porting and polishing the turbo. That should give me similiar results as a boost controller. I.e quicker spool and holding boost longer.
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