i am having a bit of a problem on the exhaust setup. i want to run long tube 1 3/4 headers. i also want a 4inch single pipe catback over the axle. i see mufflex makes a 4 inch cat back, and hooker makes the headers. but then id have to get someone to custom make parts of the exhaust from the headers to the catback.

does anyone make a bolt on kit? somthing that would include LT headers, y-pipe, catback in the set up that i want?

mike

 

I am not sure about the set up that you want but I will tell you that a big misconception people have is that you have to run bigger pipes to get more power...I can tell you that it doesn't matter how big your pipes are...I would worry more about the header design...you can get just as much power out of a 2.5'' system as a 4'' system, maybe even more...The header primary pipes should be tuned for max power at desired RPM, and it doesn't matter how closely matched the primary lengths are, just that they are tuned correctly...another sensitive area is the collector length; once again you want best power for desired RPM... After the headers you have to consider how much restriction your cat and muffler have; if your cat/muffler only flow a certain amount then it doesn't matter how big the pipe entering or exiting them is it will still only flow as much as your greatest restriction. I hope that this helps you avoid some heart ake and prompts you to research exaust before you make any rash 4" decisions. Good luck.

 

i was hoping to change everything from the headers to the mufflers.

heres some of my setup if it helps

406
11.3 compression
LT1 intake
comcams xe284 cam
world products motown220 heads

i want more power on top, bottom end is unbelievable. but from 4500 up it doesnt have enough.

exhaust that im running now is:

flow tech shorty headers 1 5/8
hacked looking 2in y pipe
3 in catback

 

With the set up you gave me I have a few questions...
1. What kind of igniotion/destributor are you running?
2. What kind of overlap does your cam have?
3. Do you have a good air source?
There are some reasons behind these questions...
1. If you are running stock HEI then your top end will most likely be limited by the igniton/destributor, as the spark starts dropping off at about 4500 RPM
2. As you probably know, you need overlap to achieve greater power figures for the fact that it helps fill the combustion chamber. The meer action of the piston moving down the bore only generates about 1 PSI of intake pressure; when you have overlap between the intake/exaust port that intake pressure shoots up to around 7 PSI. Also, lift is one area on an engine that more is always better (the only limit beeing your piston face and the functional range of the valve train)
3. If you do not have a good air source your engine will sufficate at high RPM when the demand for air is increased...never underestimate your engine's need for air, cold air if possible.