LongTubes on a S/C

98GTVortech said:

I was thinking of getting longtubes for my car I have a supercharged 98 GT and i got quoted 200 for labor which i thought was pretty good. I am wondering what kind of gains can i expect and what other modification i will need. Currently i have a off road h pipe 2.5 and its a MAC. Will that fit on the LT's or am i going to have to get something else to fit the LT"S. Thanks to all who reply.


Anthony

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You'll have to get a shorty h-pipe.

get the matching shorty prochamber

oh

you should see atleast 10 HP out of it..

This was taken from the KB web site, and should give you a pice of information to make a more informed decision on the headers.


"Long tubes make very little, if any, power or actually lose power according to our customer reports. They eliminate the pre-catalytic converters. That isn't 50 state legal. And don't confuse any power gains from removing the pre-cats with header gains. Pre-cat and cat removal will net around 10HP. In our opinion, headers for the 4.6 GT aren't worth the small peak power gains and expense. Always keep in mind that any power gain from exhaust (headers, cat back, and cats) is incrementally proportional to engine air flow/HP and reduced back pressure. That's why some products make "0" Hp on stock or +100HP engines but more on a +200HP engine. Every component has it's limits. Example: If the headers make 20HP at 700HP but nothing a 400, 500, and 10HP at 600HP why would you buy headers for an engine that will never make 600 or 700HP?"

Just my .02 cents.

I was under the impression that everyone that got them seemed to get pretty good gains with them? And also from what I have read, 200 bucks for a full longtube install is a pretty decent price considering its like an 8 hour install( i guess this is if its your first time). Whatever you do, im sure it will sound really nice with some lt's.

Kind of off topic, but what kind of power numbers are you seeing right now? I'm thinking about buying a used vortech for my '98 GT. I'd be keeping the 3.6" pulley, though. Do you know what your numbers were with that pulley?