2.25 " or 2.5" ?

 

i was originally gonna go all out with performance mods but do to lack in funds and reassesment of priorities i think i'm just gonna get an exhaust. I already have the intake.......i guess that would be considered as basic mods. Could you explain why you suggest 2.25 for basic and 2.5 for heavy?

Thanks again

 

If I couple the R/T cat convertor with the HKS Exhaust would that be considerd a stupid thing to do becasue I don't have a full cat back like the Greddy Evo?

Basically, I;m asking if it's pointless to get the R/T cat if I won't have a full catback like the Greddy.

 

Hi Kevin!!!

 

what wouldbe the negative affects on the car/ torque/horsepower levels
if I got a 2.5" anyway?

 

I say 2.5" .... if you get a y-pipe, it will be 2.5" ... you will want to keep the exhaust diameter the same throughout....

 

it's a myth that back pressure helps.....

man everyone thinks this, but it's not true.

2.5 should be fine...

 

 

just go with a 2.5". There's no need for a 2.25" exhaust on a 3.0L engine.

 

2.5". Period.

Check November's SCC for a general guide to sizing.

 

Backpressure helping on an NA motor is a myth. Not trying to flame. Less backpressure is always better, the determining factor of whether you lose torque is exhaust velocity. In order for the exhaust to leave the cylinder as quickly as possible is for there to be less pressure in the exhaust pipe. This is created by high exhaust velocity, the exhaust gases leaving the engine quickly. The best way to get most power is to have less back pressure, WITH high exhaust velocty, a really big diameter pipe decreases backpressure but the exhaust leaves the cylinder quickly but doesnt move as fast through the piping. 2.5inch is optimal for our engines, make sure its mandrel bent though, mandrel bends increase exhaust velocity.

 

So what if I just change the muffler, If I buy one of these univeral fit muffler, what size should the inlet be? 2.25" or 2.5"?

Remember this is just if I change the MUFFLER only.

Dixit

 

Exhaust wrap helps the velocity because it keeps the exhaust temp more stable.

 

this is true

 

You are overlooking the exhaust pulses and the overlapping of the valves to help low end grunt. If you have no backpressure you will not be able to utilize the overlap and low end torque will suffer. Yes, less backpressure is 'better' for race applications where the vehicle is at higher rpms but for street use you have to find the fine balance between the two.

*edit* I spelled "pulses" wrong.. forgot the first "s"

 

Okay.......I have a JWT popcharger and I'm planning on getting the
R/T Car convertor and the HKS exhaust. How will this combination affect my low end and high end torque?

 

I would say get a y-pipe before getting the cat and HKS exhaust... it will be more worth it.

 

You should not run into any problems. Make sure you get the Y pipe to get the most out of the rest of the exhaust.

 

so why doesnt anyone just run with no exhaust piping at all whatso ever? just put headers, and everything else, screw it.. Think man think.

 

How come there have been tests that say the BPipe on 5th gen isnt that restrictive. The piping just behind the resonator is so tiny, and thats doesnt affect the back pressure at all?

 

you will have no low-end.... it will be LOUD.... and it will be quite illegal