does removing the catalytic converter add HP? Options

[nate95]

Hey i was just wondering if i were to remove the catalytic converter if it would add any horse power? or what about getting a "Y" pipe before the cat. so i can still have the cat. but have it go straight out when i want to race?

[hitcachi]

No it doesn't. Sorry. You can argue better flow all you want, but......no it doesn't.

So turbo cars don't gain HP when they removed their cats?

Wrong,

Or certainly wrong on JDM cars, when you remove the cat you should see around a 3-5 BHP increase due to the exhaust gases exiting the system quicker, this has been proven on rolling roads. I removed mine on my GT-4 and there is a huge difference, the turbo spools up a lot quicker and it now spits flames out of the exhaust

Nathan

Come on guys...get yer brains into gear ...of course removing the cat will gain you BHP...be it in an N/A car or a turbo.....whats the first law of modding????? better breathing for the car, be it inlet or exhaust...the CAT restricts the exhaust gas escaping from the engine, remove ANY restriction to flow and the car is going to breath easyer.....and get more BHP (to get more air in, you have to get the spent air out etc)...in stock form there will be only a slight difference on a N/A car....turbos get much bigger benifits. Can be around 15-20BHP released from getting rid of the CAT (I got 16BHP increase from removing the CAT from the Faff...but I have seen the same type of car gain 30BHP) ...as soon as the mods start to appear, then the benifits of removing the CAT will increase Exponentially.
Also as CATs get old they start to block up with crap etc....do yourself a favour get rid of the CAT...but beware at MOT time.(Brits only)

Haha, you guys crack me up. Yes having no cat will increase hp ON A TURBO CHARGED CAR AND/OR HIGHER HP GT-FOUR. This man happens to have a Toyota Celica ST, making a whooping little over 100 hp. Hmmmmm, whats going to happen when that cat is removed. The environment is going to get more polluted and his car might get a little louder, but it wont get faster. It will just become illegal and unable to pass emissions. If you were a turbo charged car or a car that was putting out a considerable amount of HP then, YES it would help. Did you know "GASP" that they also make performance cat's that allow for excelent flow while still allowing the legality of your automobile?