Alright guys i've been pondering this for sometime now...i have finally decided to get an exhaust cutout for my 305 which would be right behind the y pipe. I'm just wondering what kind of horsepower gains i could see...would they be noticable or would i hardley feel anything different other than sound? Thanks guys

 

Any increase in horsepower will depend on how restrictive your exhaust is after the cut-out. If you have already improved on the stock exhaust system (by replacing it), you'll probably only notice an increase in sound.

 

I have one on my '88 TPI 305 (LB9) 5 speed car. Ran two 14.73's through the exhaust and Hooker shorty headers with Hooker's mandrel bent Y pipe (3" intermediate pipe to a Thunderbolt brand flowmaster knock off muffler and stock tailpipes) and when I opened the cutout I pulled a 14.47, then let the car cool an hour and did a 14.34. It definitley helped the pull up top. With manifolds and that same system I shifted at 5 grand and now it pulls 52-5300.

Cutout is a Hearthrob brand purchased through JC Whitney, and it is installed where the cat used to reside. I reach under the car with a welding glove on at the track and remove 3 wing nuts to take it off.