I went ahead and put a full flowmaster cat back exhaust with 3" pipes all the way back to a single chamber flowmaster exhaust/.

I have a 5.4 l v8 with a K&N intake and and edelbroc throttle body. so iff you can tell me i would appreciate it.

i really like the sound and i just want to know if i ****ed myself over on the power

 

I have a 4.6 v8 & I was previously warned in the forum that a 3" is too much flow & not enough back pressure. That's all I know of.
B - Dub

 

You still have factory cats and pipe to there correct? If so, you're not loosing anything. I have dual 3 inch on a 5.4 and all I heard was you'll loose low end torque, but mine makes full torque by 2800RPM and rides it all the way to 4000 before begining to fall off.

 

was these numbers with or without your supercharger?

 

I had a 3 inch SI/SO with a 1-chamber IMCO (identical to the Flowmaster) and I
lost torque compared to my Magnaflow. So yes, you probably did. Now the Flowmaster guys won't believe it, but I bet throwing a Magnaflow muffler on there will yield better torque than a comparable Flowmaster. Let the flaming begin.

 

i HATED and i repeat HATED the sound of the magnaflow

 

That makes two of us. I put the magnaflow kit on last week and think it sounds like a red neck chevy now. mine is getting taken off today!

 

mine was on for 48 hours and thats just cause they were closed on sunday

 

Well I got 3 inch inlet and 2.25 outlets when stock i had 2.5 inch in and 2.5 inch out but I can tell i lost torque...

 

you didnt lose ant HP or TRQ you gained in both departments, dont worry about it sit back and enjoy the awsome sound of your flowmaster

 

I'll concede that, its with. One thing though, I had this exhaust on before the blower for several weeks and I found an increase of 1.5-2MPG average and there was no noticable loss felt, although I didn't run out and dyno it till the blower came into play.

And, I think the magnafart sounds like dirty chit as well.