exhaust question

[drue1986]

hi im new to this site but i have a question about my exhaust. the truck has been sitting for about 3 years im just getting back on the road and i need to put an new exhaust on ill be using the stock cats then i got a 3 inch cherrybomb. is the 3 inch to open for the stock 4.0 im open for suggestions

 

[ranger]

you could put a 2.5 and attach it to the 3 3 is alittle to big

 

[suzuki2903]

according to flowmaster 2.5 inch tubing is the best for 4.0 engines... im having mine installed next week so hopefully it will sound good

 

[Wicked_Sludge]

3" is too big for a low revving engine like the 4.0. its going to hurt your bottom end performance.

i wouldnt go larger than 2.5".

 

[se7en]

I would save money. a 2 foot piece of straight pipe is 4 bucks

 

[drue1986]

ok perhaps ill go back to the parts store and get the 2.5 and save the 3 for a project i got in mind gen1 351w c-6

 

[woodyedmiston]

Somewhere in my collection of books I have a copy of an engineering based book on exhaust systems. See the Amazon Site below.

In the book, the general consensus of the researchers was that a single exhaust worked better with a six cylinder because of an harmonic related to the firing order and the exhaust pulse timing. At that time the I6 we were racing had duals. We built a single exhaust system and tried it on the dyno. It was years ago, but I remember that the difference was enough that we completely redesigned the system on the race car. The difference held even after we added mufflers a year later. Just FYI

http://www.amazon.com/Scientific-Ex...ing-Performance/dp/0837603099?tag=959media-20