Will I see any signifigant gains using a Flowmaster Y pipe and gutted cats (with a straight pipe thru them) on factory manifolds, or should I wait till I can save up for LT's? I'm power hungry. And impatient.

 

Wait till I get my Magnaflow on and I go to the track...Its going o as we speak and Im going to the track tonight if if turns my SES code off. If not then I'll be at the track next week after i replace the rear o2

 

You wont see anything significant but it should give you better top end though. With lts' and no cats you should see atleast a 20hp gain at the wheels.

 

I dont now about 20HP at the wheels but I will say I've seen personally 12HP

 

I am running a flowmaster y and I got some u bends and welded up a y pipe from the stock manifolds to the flowmaster, then into my 3". I did this before the lt's I noticed more of a difference from getting rid of the cats and crappy stock ypipe than I did from the lt's.

If I had to guess I would say at least a 25 rwhp gain it was unbelievable just from redoing the ypipe.

Dont gut the cats just chop the ******* off and weld up a y into the flowmaster collector. You will gain alot more than you think

 

Switching from dual Flowmaster 40 series, to a catless- Pacesetter- magnaflow setup, I noticed a very significant SOTP gain down low as well as up top!

 

Thanks for the info, so ditch the cats, and use the Flowmaster Y and I'll notice some good gains huh? Sounds good what size Y 2.5 to 3??