im guessin it would run better if i did, but im not 100 percent sure and i dont want to if its going to hurt my power.
in theory, it should improve my performance.. so here we go..
i have an 04 L61 5speed cavalier and so far i got a magnaflow exhaust and a home made cold air. the reason i ask this is because my pipe broke right before my muffler and i was riding around with open exhaust for about 6 months haha, (and it actually sounded real good, suprisingly) but when i put my pipe back together in the spring my car ran alot better. i can only attribute this to increased back pressure. now if i were to take my cat off on an esentially stock motor, would the drop in back pressure hurt my performance?
sr71blackcav
Dropping back pressure can only increase performance.
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
Kronos Performance
WPI Class of '12 Mechanical Engineering
WPI SAE Risk and Sustainability Management Officer
Leafy (Club Jeffie FEA man) wrote:Dropping back pressure can only increase performance.
this. any drop in backpressure is good. HOWEVER, you must have enough of a flow to keep the scavenging effect going. basically, on a stock engine, no. boosted of full blown N/A? sure.
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mines gone....feels a tiny bit of low end torque gone, like i need to get on it a bit more for daily driving....but at WOT feels more free, nothing huge in performance but it did give some gains, deffinately alot louder too
mine is also 95, so i passed inspection without it....dont know wher you live or what you even care about inspection stickers lol maybe you got the hook up for a fake
Remove it! I just did but I also went up to a 2.5 inch system. The car is faster, plus I got more low end torque. Can't say how much the straight pipe helped as I changed exhaust size. Even my hi flow cat caused some resistance to exhaust flow!
"FRIENDS DON'T LET FRIENDS DRIVE STOCK"
02ECOTECIMPORTKILLER wrote:Remove it! I just did but I also went up to a 2.5 inch system. The car is faster, plus I got more low end torque. Can't say how much the straight pipe helped as I changed exhaust size. Even my hi flow cat caused some resistance to exhaust flow!
just punch out the cat, that way for emissions your cat is still visibly there, but with no restrictions, just open pipe.
blucavvy wrote:02ECOTECIMPORTKILLER wrote:Remove it! I just did but I also went up to a 2.5 inch system. The car is faster, plus I got more low end torque. Can't say how much the straight pipe helped as I changed exhaust size. Even my hi flow cat caused some resistance to exhaust flow!
just punch out the cat, that way for emissions your cat is still visibly there, but with no restrictions, just open pipe.
Wouldn't that throw a check engine light? for low catalyst efficiency? or whatever the bat cat code is
I am HPT Tuned and I have the catalytic converter's 02 sensor disabled. Punch out the honeycomb, you will get a few ponies!
"FRIENDS DON'T LET FRIENDS DRIVE STOCK"
I ditched mine for the main reasons of 1. Losing what would have been the only restriction in my exhaust and 2. One less item to have to worry about replacing when it goes bad down the road.
its an old concept. time for something new to take the reigns. - Z yaaaa
Backpressure is never a good thing, idealy you want your backpressure to be ZERO.
Reducting your exhaust velocity is what hurts performance....that being the case, run a test pipe in place of the cat.
I haven't had one in a few years now, exhaust smells a bit more like gas but other than that no problems.
BTW if your exhaust was broken off at the muffler and it ran better upon reconecting it....odds are it was a mental thing...as that would make no differance, if anything the car should feel slower.
I wouldnt do it if your car is your dd. Maybe i would if you take it to the track. But if your not. Using your car for racing at high rpms all the time your basically not going to gain anythiing by smashing out your catts guts. A straight pipe with your cat gutted and welded around it would give the appearance your still legal and give the benefits of more flow.
Very interesting!
02ECOTECIMPORTKILLER wrote:I am HPT Tuned and I have the catalytic converter's 02 sensor disabled. Punch out the honeycomb, you will get a few ponies!
Did you read that link?
Not until now. My car is being built for top end and currently performs well in high RPM. if I gained more up top with test pipe then that works for me. Car is not a DD. Interesting link
"FRIENDS DON'T LET FRIENDS DRIVE STOCK"
usefull info. i dont have emission checks where i live. ..ohio baby lol oh and NEWT, it did run alot better with the exhaust hooked up.. dont ask me how.
sr71blackcav
I got a catco hiflow cat, was to nervous to just bypass all together and I also had to get an o2 simulator to plug in were your sensor from your oem cat would plug in. Now I have the pacesetter header with downpipe then had shop weld in new catco converter then had a custom mandrel bent 2.25 catback exhaust ran with my magnaflow muffler. It sounds great and throaty until about 3500-3700 and higher it starts to cackle or pop idk how to explain it but I think I need a resonator or Im thinkin if I get say an n1 apexi muffler it will sound better.
What muffler are you running on your car that makes you think a fart can will make it sound better? No muffler at all?
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
Kronos Performance
WPI Class of '12 Mechanical Engineering
WPI SAE Risk and Sustainability Management Officer
Leafy (Club Jeffie FEA man) wrote:What muffler are you running on your car that makes you think a fart can will make it sound better? No muffler at all?
+1
if its too raspy then a resonator will HELP (doesnt change the sound as much as a muffler). I have always used chambered mufflers instead of the straight through canisters because I THINK they are too raspy (beauty is in the ear of the beholder).
Mufflers like the flowmaster 60 series, Apex-i world sport, tanabe Hyper medallion are MY favorite sounding mufflers for a street car. Sure u will sacrifice a few ponies but u wont sound like a jackass cruising down the street.
my preference is a turbo world sports with a 3" inlet for alot of motors... if u think 3" is too big, go for the regular 2.5" world sport.
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EFFICIENCY DETECTIVE
Fast cars. I respect them ALL. Brand elitism is for fanbois and benchracers
daily: 99 civic Si
deceased: 95 cavy '00 LD9 auto swap (vandalized)
I want to try out the Hooker Headers Maximum Flow. A lot of different groups of v8 guys have tested a boat load of different mufflers and that come out consistently as one of the quietest while still flowing near the top.
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
Kronos Performance
WPI Class of '12 Mechanical Engineering
WPI SAE Risk and Sustainability Management Officer
Leafy (Club Jeffie FEA man) wrote:I want to try out the Hooker Headers Maximum Flow. A lot of different groups of v8 guys have tested a boat load of different mufflers and that come out consistently as one of the quietest while still flowing near the top.
Let us know how it sounds please.... I do know that a 40 seies flowmaster sounds like dog@!#$ though after a friend ordered the wrong muffler lol
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EFFICIENCY DETECTIVE
Fast cars. I respect them ALL. Brand elitism is for fanbois and benchracers
daily: 99 civic Si
deceased: 95 cavy '00 LD9 auto swap (vandalized)
you guys think the apexi n1 muffler is a crap fart can? most people have cans on these cars all day! I just watched a video of a cav with the pacesetter monza exhaust and muffler and it sounded worse then a can muffler. my car has a magnaflow canister with the setup I already mentioned and it sounds badass not like alot of cars like some hondas I hear that sound like a straight up fart can lol
Thats because its a pacesetter cat back, it's supposed to sound like ass and rust out in a year and a half.
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
Kronos Performance
WPI Class of '12 Mechanical Engineering
WPI SAE Risk and Sustainability Management Officer
you will gain power for sure but its gonna be way loud. it all depends if you want a really loud car or not i like a quite car untill i open it up
magnaflow is the way to go on an ecotec. sounds the best by far. ive listened to alot of exhausts on youtube and magnaflow is the best.. thats what i have and its real intimidating sounding. all i have is a canister.
sr71blackcav
