high flow cat/flex fuel question
Thread Starter
Instructor
Joined: Feb 2011
Posts: 220
Likes: 31
From: NJ LBC
high flow cat/flex fuel question
I'm building a high horsepower flex fuel setup, and since i'll occasionally be running E85 and because of that and the heat it generates I have to delete my high flow cats. for those who've gone catless on a similar setup, is the exhaust smell really that bad to the point where it's worth spending the money on G-Sport 3" Ultra High Output(v2) catalytic converters instead? or will that just be a waste of money.
Racer
Joined: Jun 2013
Posts: 339
Likes: 126
From: Missouri
I'm building a high horsepower flex fuel setup, and since i'll occasionally be running E85 and because of that and the heat it generates I have to delete my high flow cats. for those who've gone catless on a similar setup, is the exhaust smell really that bad to the point where it's worth spending the money on G-Sport 3" Ultra High Output(v2) catalytic converters instead? or will that just be a waste of money.
Thread Starter
Instructor
Joined: Feb 2011
Posts: 220
Likes: 31
From: NJ LBC
lmao bruh.... you're killing me. yes well straight E85 does give off a more sweet corn smell which is pretty tolerable i would assume. i was more curious for when the mix is closer to 93 or just straight 93 octane.
Safety Car
Joined: Jul 2019
Posts: 3,841
Likes: 1,301
From: nashville TN
I run no cats 957 whp on corn and 775 on pump 93. there isnt much smell after the o2 sensors warm up. yes cold start its gotta ripe smell on pump 93. after that I dont pay any attention to it but where I live its basically corn yr round. try huffing ignite red 115 for a true corn high!!
Melting Slicks
Joined: Jun 2019
Posts: 2,035
Likes: 928
From: near philly
as long as you are driving the catless car is smells fine. If you are driving behind it the smell makes you want to kill yourself after about 5 minutes
anytime I get stuck behind someone catless I pass that **** first chance I get
huh?
what do 02 sensors have to do with exhaust pollutants on a catless set up?
anytime I get stuck behind someone catless I pass that **** first chance I get
huh?
what do 02 sensors have to do with exhaust pollutants on a catless set up?
Safety Car
Joined: Jul 2019
Posts: 3,841
Likes: 1,301
From: nashville TN
when the car is cold the o2 sensor tells the ecu it needs more fuel. once the motor heats up the afr is reduced and also the smell. watch a widened afr when you first start a cold car vs a hot car
Melting Slicks
Joined: Jun 2019
Posts: 2,035
Likes: 928
From: near philly
Safety Car
Joined: Jul 2019
Posts: 3,841
Likes: 1,301
From: nashville TN
something else to remember is the tiniest exhaust leak will magnify the smell on a full catless system. especially if its a 2 piece mid pipe ie: eos and your sitting right on top of it
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Jun 2019
Posts: 2,035
Likes: 928
From: near philly
maybe E85 isn't so bad, that's believeable.
I used to make biodiesel and that smelled good too
but catless with gas sucks hot engine or cold. Getting stuck behind a catless guy on gasoline ruins any drive
I used to make biodiesel and that smelled good too
but catless with gas sucks hot engine or cold. Getting stuck behind a catless guy on gasoline ruins any drive
Intermediate
Joined: Nov 2024
Posts: 25
Likes: 0
From: Houston, TX
I'm building a high horsepower flex fuel setup, and since i'll occasionally be running E85 and because of that and the heat it generates I have to delete my high flow cats. for those who've gone catless on a similar setup, is the exhaust smell really that bad to the point where it's worth spending the money on G-Sport 3" Ultra High Output(v2) catalytic converters instead? or will that just be a waste of money.