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Old 07-25-2005, 03:17 AM   #1 (permalink)
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Gen5 Exhaust Questions

My next mod is going to be the exhaust but i still have a couple questions about it. I want to get HP gains from this mod, so i was gonna get the Borla "Cat-Back"

http://www.borla.com/products/produc...rod_sku=140061

the thing is.....It doesn't have piping to the cat, i know i will gain some HP, because the stock muffler is so huge.

How do i get the most gains from changing the exhaust? should i just stick with this Borla? or get it custom?

Also, this is going for $200, i was thinking of buying this and going to an muffler shop and get custom piping. would it be cheaper just to do it all with them? how much is it just to change the piping?

i just need some info on $$$ and HP, and all that good stuff.
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Old 07-25-2005, 11:16 AM   #2 (permalink)
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Don't know about hp gains, but the Meineke shop I went to wants $420 for a custom 2.5" system with a Borla muffler from the resonator back. Removing the resonator would give you the most hp gain but could end up sounding ricey. Still tossing around some ideas in my head for my exhaust system.
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Old 07-25-2005, 11:56 AM   #3 (permalink)
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the only real hp gains youll get from exhaust is if you swap your headers down, i got a magnaflow system which gains 10-15
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Old 07-25-2005, 03:27 PM   #4 (permalink)
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Quote:
Originally Posted by RiZLA
the only real hp gains youll get from exhaust is if you swap your headers down, i got a magnaflow system which gains 10-15
Thats not completely accurate... with wider piping and a bigger muffler, you have less exhaust resistance and more high-flowing air, and you gain HP. Of course headers would add even more, but its not as though you get nothing from swapping the exhaust.
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Old 07-25-2005, 08:16 PM   #5 (permalink)
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you ESSENTIALLY get NOTHING in terms of POWER on a n/a motor

a good exhaust will give you better THROTTLE RESPONSE all though the revs, a shit one will rob you of low en torque and response.

if you want REAL power you have 3 options

1- headwork+cam regrind
2- get boosted OR
3- go on the bottle

either way, get a decent ecu tuner to keep it under control.
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Old 07-25-2005, 10:17 PM   #6 (permalink)
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^ it's still less work for the engine if it can push exhaust gases out easier =/
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Old 07-25-2005, 10:45 PM   #7 (permalink)
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Quote:
Originally Posted by Super Kaioken
^ it's still less work for the engine if it can push exhaust gases out easier =/
which gives you better response, not outright power. and remember on an n/a motor exhaust gas doesnt get 'pushed' out like on a boosted car, they need to be 'vacuumed/sucked' out which is why poor design leads to no gains and loss of torque.
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125 front wheel horsepower with major retard issues between 4500-5200RPM -
OD switched off, even when not in 3rd results in major power loss/rpm drop.
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Old 07-25-2005, 10:53 PM   #8 (permalink)
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ohhh.....no power gains.....alright. =/
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Old 07-25-2005, 10:58 PM   #9 (permalink)
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you DO get gains, but nothing to write home about, its not worth the 30 cents for the stamp, or even the hassle of clicking send on an email.
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125 front wheel horsepower with major retard issues between 4500-5200RPM -
OD switched off, even when not in 3rd results in major power loss/rpm drop.
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Old 07-26-2005, 03:02 AM   #10 (permalink)
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i think i'll get the Borla.....the stock pipe is 2.25 which is sufficient...correct? $238 for an axle back
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Old 07-26-2005, 03:10 AM   #11 (permalink)
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Quote:
Originally Posted by terrastrife
you DO get gains, but nothing to write home about, its not worth the 30 cents for the stamp, or even the hassle of clicking send on an email.
Mate..no gains?? You must have a pretty shit exhaust system....
The gains I got from changing my exhaust system were VERY noticable. It wasn't JUST throttle response, there IS more power there for sure. Much more willing.
And as for N/A cars requiring the gases to be "vacuumed/sucked" out...i don't understand your logic here. Your saying that, after the combustion process takes place, the gas is, in no way, forced out of the chamber, but sucked our by some imganey vacuum cleaner at the end of the pipe....hmmm I was wondering why I wasnt getting good power :-/
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Old 07-26-2005, 03:11 AM   #12 (permalink)
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lol finally someone else says something. YAAAY.
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Old 07-26-2005, 06:59 AM   #13 (permalink)
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Quote:
Originally Posted by JetspeedCamry
Mate..no gains?? You must have a pretty shit exhaust system....
The gains I got from changing my exhaust system were VERY noticable. It wasn't JUST throttle response, there IS more power there for sure. Much more willing.
And as for N/A cars requiring the gases to be "vacuumed/sucked" out...i don't understand your logic here. Your saying that, after the combustion process takes place, the gas is, in no way, forced out of the chamber, but sucked our by some imganey vacuum cleaner at the end of the pipe....hmmm I was wondering why I wasnt getting good power :-/
you probably had an old clogged up cat.

by vacuum i mean there is no major positive pressure forcing the gas out... the trailing end of the previous exhaust pulse pulls the next pulse of gas along... this is why primary length and diameter is so important.

a fre flowing 'cat back' does little execpt some extra noise on a v6 camry.

the stock manifold logs are of a decent design which let gas pulses travel along one after another already.

the main concern is the standard y peice, which at low RPM provides quiet and acceptable results but resticts top end somewhat with its cramped up design. a tuned length y peice is almost impossible to make as the bends for the rear bank will mean that pipe shoul dbe shorter, so a simple straight down into a y peice merge will provide good flow in the higher rpm range, but not much in the lower end due to the fact it is no longer tuned length like the stock one was.

the 2nd main concern is that old cat converters get cloged, and this robs you of MAJOR power. the OEM toyota camry v6 cat is quite good -- larger then some aftermarket hi-flow units already. if this is still good then changing to a good (lets say, magnaflow) hi flow will also only provide minimal gains.
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OD switched off, even when not in 3rd results in major power loss/rpm drop.
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Old 07-27-2005, 02:46 AM   #14 (permalink)
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I purchased the Borla "Cat-Back" today.....it's really an axle back since it doesn't have piping to the cat......i think that's what it is. i'm just learning about this stuff. But better response is a good thing.

a cat getting clogged. is it possible for the pipes to be clogged too? how could you clean the cat/ pipes?

no jokes about spraying water in the exhaust plz. i'm not that noobish lol.
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Old 07-27-2005, 03:05 AM   #15 (permalink)
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IMO, you shouldn't have an clogging issues with a car that new...I too am still wondering what to do about my exhaust. I want something quiet most of the time, but something that will also let people know my car's not stock when I step on it. Also, I'm no welder or anything, but how hard could it be to simply make one end of the pipe shorter? Maybe I'm just misunderstanding what you said.
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