racerfox

iTrader: (4)

i have tsp long tubes and a tsp ory im runnign just the y right now will i gain or lose hp if i add my stock catback?

redbadss

iTrader: (4)

i'm not a dyno expert, but i assume you would lose about 5-8rwhp with the stock catback.. just a guess on my part but you wouldnt gain hp because the stock catback will be more restricting than running without a catback,

NemesisLS1

iTrader: (3)

I agree... Plus the stock catback is heavy!!

99bowtieZ

I think I remember seeing a guy with longtubes and with an aftermarket Y and a cutout right after it in the single pipe section, then the stock catback. He got it dyno'd and I think he gained almost 20hp just from opening the cutout instead of sending it through the stock catback... I'll try and find the thread, I could be murdering that story pretty good... Bottom line is your gonna lose power going back to the stock catback...

Sicko

iTrader: (1)

Not only hp, but less weight. Like he said.

racerfox

iTrader: (4)

what about a after market catback?

99bowtieZ

Then you will not lose as much, but you have to consider that no matter what it is, adding onto your exhaust is going to restrict the flow.

teke184

iTrader: (5)

it would go like this...or close to it...depending on the catback:


stock catback = 20hp loss
aftermarket catback = 5-10hp loss


if you want to go cheap, and stay stealthy....put a few feet of 3" pipe off the Ypipe, into a 3" cutout, then your stock catback.

quiet when you want it, loud and power when you want it.

5.slow99

if you dont care about the raspy sound then keep the y-pipe, but then if you do add a catback then you will fix the back pressure problem that some people run into about the car not returning to idle very quickly.