View Poll Results: How bad are the fumes without cats on YOUR car?
Voters: 41. You may not vote on this poll
Longtubes and no cats
Tech Contributor
Joined: Jan 2004
Posts: 20,030
Likes: 289
From: Wylie TX --> Less is More, except under the hood !
I was told you would only loose 2-3 rwhp with them installed. I got the Random High Flow cats on my Heads/Cam/LG Pro setup. Keeps me legal too. 
Toque
Toque
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,650
Likes: 4
From: Ringgold GA
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
When I was internally stock, fumes were nearly non-existent. Standing directly behind the car, you could smell it, yes...driving it? no, not offensive at all.
With a 20* overlap cam, the best tuning in the world can't prevent it, and is strong enough to be noticeable even inside the car.
Fortunately, I embrace it. A little VP110 leaded mixed in sweetens up the smell even more.
With a 20* overlap cam, the best tuning in the world can't prevent it, and is strong enough to be noticeable even inside the car.
Fortunately, I embrace it. A little VP110 leaded mixed in sweetens up the smell even more.
Tech Contributor
Joined: Jan 2007
Posts: 19,421
Likes: 1,146
From: Dyer, IN
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Pro
Joined: Aug 2007
Posts: 619
Likes: 1
From: ATLANTA GA
OK
AGE 22. HCI LT's No cats ti exhaust. With the TI exhaust its pretty tame I wanted a little more wild rip. Cats would make it non existant.. For most older guys they would love the way the car sounds outside with no noise inside.
Yes you can smell the fumes inside the car, when its rolling you can smell nothing and its entirely bearable. Even with me being a coupe and the roof removed is ok coming to stops for a short period of time. Heavy gridlocked interstate traffic is another thing.
Sometimes it gets pretty extreme smelling like raw fuel at times. I could see how this could cause a problem.
Its not so much the cats making horsepower as they kill a good exhaust tone. The corvette is already challenged to sound good and not motorboat to begin with. The 4.6 mustangs sound very good without cats and a simple flowmaster.
Its just not so easy to make these LSX sound as good. With a cam and no cats my car actually has a rumble to it that was non existant with cats.
AGE 22. HCI LT's No cats ti exhaust. With the TI exhaust its pretty tame I wanted a little more wild rip. Cats would make it non existant.. For most older guys they would love the way the car sounds outside with no noise inside.
Yes you can smell the fumes inside the car, when its rolling you can smell nothing and its entirely bearable. Even with me being a coupe and the roof removed is ok coming to stops for a short period of time. Heavy gridlocked interstate traffic is another thing.
Sometimes it gets pretty extreme smelling like raw fuel at times. I could see how this could cause a problem.
Its not so much the cats making horsepower as they kill a good exhaust tone. The corvette is already challenged to sound good and not motorboat to begin with. The 4.6 mustangs sound very good without cats and a simple flowmaster.
Its just not so easy to make these LSX sound as good. With a cam and no cats my car actually has a rumble to it that was non existant with cats.
Last edited by vettekidc5; Nov 14, 2008 at 08:28 PM.
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,650
Likes: 4
From: Ringgold GA
OK
AGE 22. HCI LT's No cats ti exhaust. With the TI exhaust its pretty tame I wanted a little more wild rip. Cats would make it non existant.. For most older guys they would love the way the car sounds outside with no noise inside.
Yes you can smell the fumes inside the car, when its rolling you can smell nothing and its entirely bearable. Even with me being a coupe and the roof removed is ok coming to stops for a short period of time. Heavy gridlocked interstate traffic is another thing.
Sometimes it gets pretty extreme smelling like raw fuel at times. I could see how this could cause a problem.
Its not so much the cats making horsepower as they kill a good exhaust tone. The corvette is already challenged to sound good and not motorboat to begin with. The 4.6 mustangs sound very good without cats and a simple flowmaster.
Its just not so easy to make these LSX sound as good. With a cam and no cats my car actually has a rumble to it that was non existant with cats.
AGE 22. HCI LT's No cats ti exhaust. With the TI exhaust its pretty tame I wanted a little more wild rip. Cats would make it non existant.. For most older guys they would love the way the car sounds outside with no noise inside.
Yes you can smell the fumes inside the car, when its rolling you can smell nothing and its entirely bearable. Even with me being a coupe and the roof removed is ok coming to stops for a short period of time. Heavy gridlocked interstate traffic is another thing.
Sometimes it gets pretty extreme smelling like raw fuel at times. I could see how this could cause a problem.
Its not so much the cats making horsepower as they kill a good exhaust tone. The corvette is already challenged to sound good and not motorboat to begin with. The 4.6 mustangs sound very good without cats and a simple flowmaster.
Its just not so easy to make these LSX sound as good. With a cam and no cats my car actually has a rumble to it that was non existant with cats.
Melting Slicks
Joined: Sep 2006
Posts: 2,736
Likes: 7
From: Redding CA
I used to run with no cats and LT's but went to magnaflow hi-flows for smog.
I checked the "fumes but live with" box but to be honest I didn't really notice them...other car is a 68 Camaro w/406 small block 11.1 to 1 iron heads...
There are a little more noticeable fumes in that car so I never really realized them in the Vette but friends had asked "what's that smell?" while riding or standing behind the car....
My $.02...
DZ
I checked the "fumes but live with" box but to be honest I didn't really notice them...other car is a 68 Camaro w/406 small block 11.1 to 1 iron heads...
There are a little more noticeable fumes in that car so I never really realized them in the Vette but friends had asked "what's that smell?" while riding or standing behind the car....
My $.02...
DZ
Instructor
Joined: May 2005
Posts: 159
Likes: 0
From: Z16 Crystal River,FL.
[QUOTE=Y2Kvert4me;1567850778]When I was internally stock, fumes were nearly non-existent. Standing directly behind the car, you could smell it, yes...driving it? no, not offensive at all.
I agree No cats + Stock = Little to no fumes
No cats + H/C = fumes
I agree No cats + Stock = Little to no fumes
No cats + H/C = fumes
Team Owner
Joined: Mar 1999
Posts: 28,753
Likes: 9
From: San Jose/Bear Valley CA
CA Events Coordinator
Try running this stuff in the tank.... it works. The exhaust smells like whatever scent you add to the tank. Personally I like Cherry and Grape.
http://store.summitracing.com/egnsea...0+115&y=8&x=34
http://store.summitracing.com/egnsea...0+115&y=8&x=34
