I've got an 87 5.0 GT. Putting on complete new exhaust system-thinkin of having cutouts put in front of mufflers and dumping out back into pipes behind muffler. Will I lose power and/or low end due to loss of backpressure??

 

you will be fine... just don't use massive pipes... stick with 2.5 - 2.75 inch pipe and ya'll be alright

 

thanx for reply, forgot to mention, also thinkin of going w/no cats

 

doesnt matter... pipe diameter is what matters the most...

 

thanx again Greg, you seem to know your stuff. I wuz thinkin about goin w/ a shorty small dia. header. - any suggestions?(price don't really matter-worth it in the long run to buy the best). p.s.- your Granny is way cool

 

Don't bother with shorties...

Look into long tubes... If you don't want to deal with them (they can be a bitch and are huge)... then look into equal length headers...

I run MAC equal length (shorty) headers and recomend them if you decide you don't want LTs

I take it that you will have the rest of the exhaust done custom...

I would use 2.5 inch piping


EDIT...
In the Long Run... definately go with Long tubes... I recomend Hooker

 

I would love LT s(especially Hooker), but my car is lowered a good 2"--LT s used to hang down more. Are they different nowadays?

 

yah they hang down a bit...

They shouldn't hang much lower then the midpipe or anything else though...

You'll just want to avoid speedbumps...

 

also keep in mind electric cuts are garbage.

 

Oh really, didn't know-- I thought elec cutouts were the $h!t. whats up w/that? they don't close all the way or tempermental or what--not really been up on whats been happenin????/

 

They crap out. and dont seal all the way and make the car sound like crap.

 

Just buy some Warlock mufflers. They come w/two exits at the rear of the muffler. One will be for tailpipes and the other is a block off plate held on by 3 wingnuts. Had them on my car and "uncorked" they sound awesome yet loud.