jaredhunter1985

New to the LS world always been a die hard GM fan own a 85 Silverado now with some mods! but I want faster! im going to get a 01 ss 6 speed in the next few weeks! I want to make around 450rwhp without the nitrous or forced induction YET. the first mod will be new exaust and 4.10 gears! I want a mean sounding cam preferably a choppy/rough idle can yall help me select my parts on a deacet budget. this will be over a year or two not all at once!

FastKat

iTrader: (10)

You're on the right track. Full exhaust is a great start, including headers. After that heads and a cam should get you to your goal.

jaredhunter1985

yeah? what exaust would ya recommend 2 1/2 or 3" prolly use flowmaster no cats don't wanna loose back pressure and power but I want it to sound mean what kinda cam and heads ya recon Ill definatly be using chromemoly pushrods and double valve springs titanium retainers

jaredhunter1985

unless everyone thinks theres something else I should use

KCS

iTrader: (20)

Don't use Flowmaster. They've been known to cost you a lot of power. Borla is pretty popular, as is SLP and. Magnaflow.

jaredhunter1985

thanks! what size pipe would be best

FastKat

iTrader: (10)

Agreed. 3" might be overkill. Exhaust sound really depends on the person. Flowmaster does have a nice sound but it will cost you a little power. I like the straight through designs like Magnaflow, Borla, and many others.

My car has some pretty big Maganflow straight-through mufflers. It's surprisingly quiet on idle, a little louder at cruise, and much louder when you really lean into it.

jaredhunter1985

I like em loud just not where its so loud it gets annoying

mrvedit

I have a 3" Pyres system with their "race" mufflers which are straight through mufflers. They sound is exactly as FastKat says; they are quieter at idle than my old 50-series Flowmasters, but quite a bit louder at WOT.

To estimate how choppy the sound will be, take a cam's duration at 0.050 and its LSA and plug it into this calculator:
http://www.wallaceracing.com/overlap-calc.php
(Yes, use the .050 duration and not advertised duration.)

This will give you an estimate of the overlap at .050. As far as I know no stock cam has any overlap at .050 (they are all negative overlap). Something like +6 degrees overlap will give you decent chop, 9 degrees very choppy.
6 degrees overlap will lower your idle vacuum to about 12 inches; 9 degrees overlap to about 7 inches. These low number might not be enough to let your power brakes work properly!
(I run Hydraboost so that I can run aggressive cams.)

Also remember that "chop" indicates unburnt gasoline is going out the exhaust. This kills your gas mileage and if your state has emission testing, you won't pass.

jaredhunter1985

will removeing the cats hurt anything

groundZ-28ERO

nope, but of course youll have to get a tune after all the exhaust work and whatever else your doing. im running 2 7/8, no cats, ory into gmmg and it is loud as hell. thinking about ditching it and going true duals.

jaredhunter1985

okay I think ill go with headers 2 1/2 pipe cut the cats and go with magnaflows or borla true duals still need some tips on cam and head selection