88-VETTE-L98

I have a 1988 automatic and I am thinking about putting A y pipe with no cats with Magnaflow exhaust. I am keeping factory manifolds because of money and I don't feel like putting headers at the moment. First of all how much horsepower total would I gain? The mean question also would be would the computer adjust to the extra air flow on its own or would I have to burn a new chip? Thank you in advance

mlm0

Don't know about horse power gain, but esc will not have to be retuned with just those mods

88-VETTE-L98

And it won't set off any codes?

mlm0

Should not set off codes

88-VETTE-L98

Thanks for the info.

DanielRicany

Are you removing the main cat too or just the pre cats?

88-VETTE-L98

I'm actually considering removing the main cat also. Why do you ask, will that create more problems than positive?

NewbeeBob

I installed a Y pipe, no pre cats, but I did install a high flow main cat. No codes, more rumble and noise though. And, really important, I did pass state emissions in New Jersey.

88-VETTE-L98

I'm just curious how much horsepower game they would be if I removed pre and main cats and put in magnaflow exhaust.

TLS_Addict

A little, not tons of power increase unless your are currently plugged and robbing from the stock rating.

What's funny is a guy I know used some cheap, $200 Jegs headers and a longer 02 sensor on his 87 Corvette. He ran them for years. He bought them for his 84 and then got a newer Vette.

DanielRicany

If you aren't removing the main cat then I would say you would be lucky to gain 5 hp...