View Full Version : Another Cat. Conv. ?
04-16-2012, 04:26 PM
Well I have a 93 350 TBI. The catalytic converter is a giant, rusted, 24in long turd and i want to remove it. What will this do to my fuel mileage and my power? I have heard many different stories about what it will do, just wonderin if someone that has done it tell me what they experienced After i cut it out i planned on leaving if off and redoing my exhaust and runnin just a glasspack. Or would i be better off gettin a high flow cat and no muffler<=(dont really want to run this but if i have to i will). thanks
04-16-2012, 04:30 PM
High flow cat vs and old stock one is probably one of the best exhaust mods you can do. I did the same thing on my 93 and it was a big difference. I ran just the cat and no muffler for a while ( I was 16/17). It didn't sound too bad compared to some other obnoxious type setups but I would really recommend some sort of a performance muffler aswell. Now I have a magnaflow muffler behind it and it sounds really nice.
Just glasspacks sound retarded.
04-16-2012, 05:44 PM
so just the high flow cat was pretty loud? you wouldnt happen to have a video of it would you? does it sound something like this? http://www.youtube.com/watch?v=41A5LQWijY0
04-16-2012, 05:48 PM
Ya it was loud as hell, sounded pretty similar to the one in the vid I had it as a single 2.5" dumping about 2ft behind the cab though. Had a hard time hearing much even at idle, people heard me coming from about 500 yards away, shook the ground and ****ing screamed at WOT. If you want it loud I'd go that route then later on if you want to tone it down a bit all you have to do is add a muffler(s).
04-16-2012, 06:02 PM
well i want something that's respectably loud but not just obnoxiously loud and no tone. that link i posted i didnt actually think sounded to bad IMO. So back to my question if someone would answer that please....but thanks nick those were gunna be my next questions
04-16-2012, 07:09 PM
should free up a bit of power and might increase mileage a little if any at all but most likely wont be noticable
04-16-2012, 07:30 PM
Took mine off and welded on a pipe. I have a y-pipe to single muffler and dual outlet that is all stock. Sounds great. Loud but not obnoxious as open header haha. Gas mileage and power I couldnt tell you. Just did a full tranny rebuilt with new converter. Haven't driven enough. Is say if you dnt smog like me, go for it.
04-16-2012, 07:41 PM
so no noticeable loss??? i thought maybe a 1mpg gain in fuel economy, loss of a little torque, and a loss in throttle response.........but maybe im wrong
04-16-2012, 07:47 PM
No disrespect, why would u assume a lack of torque or throttle response. It more than likely frees up about 3hp. Which u won't feel and maybe 1/2 to 1 mpg if any. Removing a cat will not have any ill effect unless you have a vehicle with an o2 at the cat. Obviously not. I don't regret doing it. But if ur exhaust isn't gnna be stock the tone and volume may go way overboard without a cat.
1988 GMC 355
04-16-2012, 07:53 PM
THe only way you will see a MPG/ power increase is with putting a high flow and a muffler back in.
04-16-2012, 08:14 PM
thanks '88 for sayin it plain and simple :biggrin:
04-23-2012, 01:39 PM
just thought i would do an update. The cat got cut out for now, so im just runnin stock pipe to flowmaster single in and dual out. She is noticeably louder. power wise it seems to be more snappy and cruise a lot better. gas mileage wise it seems to be using less fuel but havent drove it enough to tell for sure yet. yep shes a full blown racetruck now :D :burn:
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