So I’m new to modifying car exhaust, I did the muffler delete and am thinking about doing the 3rd cat delete. When I rev the car and I’ve heard this on YouTube, it sounds like a vacuum cleaner at high RPMs. Is this something I need to go catless to get rid of, get high flow cats, or is there something else I can do without spending $700+ on exhaust? I’d prefer to not go catless for a few reasons. I will be getting high flow at some point, once I have the money.
Exhaust Help
- Thread starter LunarSHO
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
yaycandy
Aerospace Engineer
On this platform is better to start from the front and work your way back with exhaust as the oem downpipes are a real bottleneck. Even a catted high flow set brings out alot of flow. Not sure on sound difference from catless to catted. Pretty raspy with catless and no mufflers.
The sound just gets louder and to me it sounds like a weedwacker head spinning because of the small oem turbos. Im sure turbo upgrades greatly change the sound. Not sure if its a better sound either with larger turbos.
Open downpipes the car is not loud as turbos are "mufflers". A Yamaha sho v6 open downpipes, thats loud
The sound just gets louder and to me it sounds like a weedwacker head spinning because of the small oem turbos. Im sure turbo upgrades greatly change the sound. Not sure if its a better sound either with larger turbos.
Open downpipes the car is not loud as turbos are "mufflers". A Yamaha sho v6 open downpipes, thats loud
How is daily driving with catless? Is it enough where it’s going to grab attention too much? That’s what I really want to avoid, I’m fine doing catless if it’s not Mustang GT catless loud. When doing catless would it be best to keep the resonator on and put some flowmasters on in order to “muffle” the sound a bit more?
yaycandy
Aerospace Engineer
I bought an obx catback on ebay for cheap. Just for the piping. Its not too loud catless and no mufflers but the weedwacker noise does get annoying. So i use the obx mufflers at the back and it actually sounds throaty and decent cruising but can still be loud when gettin it
Sweet, I’ll have to look into catless then, thanks for the help.
yaycandy
Aerospace Engineer
Probably isnt much of a gain with catless over catted. You should go with catted if your county/state requires emission testing. Ppe catless can pass the odb readiness but probably not the sniffer hose
I’m in Texas and our county doesn’t run emissions, they sometimes do a visual but not all the time, I’ll have to look into all of this.
yaycandy
Aerospace Engineer
Just find someone you know and trust to do inspection
I run catless down pipes from PPE, and then stock exhaust and mufflers rest of the way back. In cabin noise is unchanged except for a slight brassy sound to the exhaust when getting on it, in the mid rpm range. Outside, only change to sound that I can determine, is that the turbos can be heard now, at all rpm ranges and throttle positions.
Do you still have the 3rd cat in the car?
Yes. I only ditched the 2 on the down pipes.
Similar threads
