I'm planning on picking one of these up and having the rest of the exhaust built around it. What size do I go for? I have a 2000 sport.

http://www.flowmastermufflers.com/sh...pmm9tbn03vs083

 

2.25(in) is stock.

You could go 2.5(in) from the cat back if you want some extra power. If memory serves correct I think its 2.5(in) pre cat.

I just put a DynoMax SuperTurbo on mine with a turn down. I did not want it going over the axle. Sounds nice plus I like the funny looks I get when other drivers hear how mean my lil' old XJ sounds.

 

I went with 2.5", but an exhaust guy later told me that I didn't need more than 2.25" with a stock engine. I don't know if that is true or now.

 

what would happen if i threw the super 44 extream 3inch duals at the end of the list on my xj. would it sound bad or not give me power?

 

Duals imo would be a waste of time. Its not an earth shaking v8 and so a single exit will give you the best sound and performance. Run 2.5" pipe and what ever tip you want.

 

i also plan on putting on a cold air intake and throttle body, is this still good with a 2.5

 

o yea and got any input on headers?

 

I have both CAI and a TB, I went 2.5". Sounds great, using a DynoMax SuperTurbo muffler but brand is personal choice.

But in answer to your question, 2.5" is good for a stock displacement. CAI and TB only allow the engine to take in air easier. A quality exhaust will allow it to expel the gases faster. Which will increase power, but mainly give you a mpg improvement and better throttle response.

If your going to go through the trouble of changing the stock exhaust manifold/header get a higher end brand; i.e.: borla, banks, etc. One that is ceramic coated would be nice as well.

 

ok, thanks man

 

No problem.

 

Nice input. Thanks

 

what sounds better super 40 or super 44 because on youtube 40 sound better to me but what do i no.

 

i ran a super 40 on my 4.7L dodge and it sounded sweet.

the exhaust shop i take/send all my business too told me 2.25 is what he would run on my XJ.

 

i like how the super 44 sounds.

 

I love the sound a flowmaster has with 6cyl engines.