When everyone says opening up the exhaust...what do they mean?....just putting an exhaust system on the truck?

 

Yes, larger diameter pipe and higher flow cats and mufflers.

 

will this bring me many performance gains?....ive posted earlier, im going with a si/do mello tone muffler into 2.25 pipe in to 3.5in. tips.....is this considered opening up the exhaust?...and is this gonna give me some gains?....my second cat is hallowed out

 

Yes, its considered opening up the exhaust but don't expect much in the way of gains.

 

Josh, is this one an EFI or carbed truck?

CMOS

 

Performance gains will be negligible unless you are making other changes that will allow the engine to breath better. (Such as port matching, performance camshaft, larger intake etc.) It is a whole system and one restriction anywhere will pretty much negate the benefit of the larger exhaust. Sort of like a kink in a hose.

 

its EFI, and how would i go about getting a bigger intake system?...or is there anyway to do this myself ect.??

thanks guys

 

About the only thing you can do to modify the efi intake manifold, short of fabricating your own intake, would be install a 302/351w throttle body, to gain full benefit, you have to port match the intake where the throttle body meets the intake. You could install a 460 throttle body but I'd say thats well past overdoing it.

I was gonna say, headers are usually considered, "opening up" the exhaust, along with the rest of the exhaust system but the stock efi exhaust manifolds are ok for stock to mild applications.

 

May not be practical. You can certainly get a performance cam and a performance chip. Rocker arms too.

Also a more free flowing air intake to the throttle body.

Perhaps someone else out there knows of a hi-performance throttle body???

Other than that, you start talking about blueprinting. CC the head, polish and match up all the intake and exhaust ports. The list never ends.

 

I don't believe that Josh has indicated whether he want these mods to be in harmony with the PCM, or does he want to mess with getting a chip or a programmer?

That question needs to be answered first, IMO.

Some, even simple, mods will casue the PCM to throw codes all day long.....

CMOS

 

Actually nothing mentioned thus far, should throw a code on his speed density engine. Speed density is sensitive to vacuum levels.


A "high performance throttle body" would be the 302/351w stock throttle body, as its larger than the 4.9's, next step would be the 460 throttle body.

 

lol...all this crap sound too complicating and expensive, i dont want a hot rod or anything so i guess ill just put my exhaust on to get my more aggressive sound and be happy with that...thanks guys for the input

 

Good answer Josh.

As the old saying goes, 'speed costs money, how fast do you want to go?'