|04-18-2002, 05:50 PM||#1|
Join Date: Dec 2001
Location: Ottawa, Ontario CAVehicle:
2002 Impreza 2.5RS
Exhaust system questions
Any suggestions here would be appreciated. I am sort of a newbie to intermediate here, so bear with me.
I am looking to add a little more HP to my stock RS. So far I have added an SPT performance exhaust (I know it doesn't really add any appreciable performance gains all by itself). I am going to be adding a CAI in the next couple of weeks. My question is this, what could I add to the exhaust system now to make some difference. I was thinking a mid-pipe in addition to the exhaust from SPT might give me some benefit in unison with the CAI. A header upgrade is basically out of my league pricewise, I wouldn't mind turning what I have now into a cat back system. Do you think I can make any gains with the SPT in the system?
Thanks for your help and patience, if I have put my foot in my mouth anywhere up there.
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|04-18-2002, 07:39 PM||#2|
Sea to Sky - OWNED
Join Date: Dec 1999
Location: Vancouver, BC, CanadaVehicle:
2003 Lexus IS300
Graphite Gray Pearl
Midpipe would help yes.
Not sure what muffler you have (SPT), but I'm guessing that it isn't the most free flowing muffler out there.
But to answer your question, yes a midpipe will help things out.
|04-19-2002, 06:15 PM||#4|
Join Date: Mar 2000
Location: Hail DarknessVehicle:
2012 dcrawford died
for your sins
The stock midpipe does have a resonator in it...which is a mild restriction to airflow...so putting on a new midpipe without a resonator will give you a bit more power. Plus it will make the car a bit louder...if you want that.
How much more power? I have no clue...sorry.
But if you want to take it a couple steps further you can have your exhaust system heat treated...coated with some material to keep the heat INSIDE the exhaust, which will promote better flow. There are a couple options...
1) Painted on coating: Some sort of ceramic type coating will work. It can be expensive...and unless you are going to be keeping those stock exhaust pipes on the car I wouldn't suggest it...due to cost.
2) Wrap: You can wrap the exhaust in a heat retention material...there are wraps out there. Problem with this is that if the exhaust is a mild steel...you could trap water against the exhaust and cause it to rust. I wouldn't suggest this if you live in a wet or snowy environment.
There really isn't too much that can be gained from the exhaust. Think of it as 4 different pieces
Header: Can be replaced with something with a better flowing design, can be heat treated, probably the most expensive part of the exhaust system. There can be smog issues.
Cat: Can be replaced with a high flow model. CARB does not like people replacing them though...so this is where you could run into the biggest trouble with the smog police.
Midpipe: One of the cheapest parts. Can be heat treated. Unless you are dealing with a smog Nazi you shouldn't have trouble with an aftermarket one.
Exhaust (Can): Many many many options. Which one gives the most HP? There isn't going to be a huge difference here...honestly. For the can it's all about looks and sound.
A full replacement system (one that replaces all 4 pieces) will give you the biggest difference. Brullen and MRT are two complete systems...which can also be purchased in parts. Both will give you somewhere around...mmm...trying to remember...around 14 hp more. A mix and match system could get the same results...but possibly less.
I think that's about it...
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