Ok thank you I just like the sound it makes at high rpm right now but kinda want that all the time

 

That would decently be the glass pack and flowmaster 10. Very mean and loud all the way threw rpms. Note on the glass back there are baffles on the inside look into it to c which way they face. Face the baffles away from your engine to make the glass pack louder

 

Hi-flow Cat give me better torque and not affect my gas mileage at all"?

 

It will help with about 2-4 mpg...not touch of a change if u find a 99-01 exhaust manifold and add upgraded injectors you will get ton better mpg.

But as far as that only a slight improvement

 

If u add a highflow cat it won't hurt your mpg. If that's what your asking

 

will it give me more torque atleast a little rather than a flowmaster 40 muffler?
im tlking hi-flow cat and pipe no mufffler

 

Yes it will give u more BC u will have almost no back pressure ...and a flowmaster 40 is a 2 chamber muffler and holds back pressure...so that. Will eliminate that and help just a lil. I suggest to pair with a CAI

 

Heres a new question. I'm building my own heat shield since i found out the hard way how hot the floorpan gets when you pull the carpet. Any rocket science ideas to this or is it as basic as I think it is? Anyone else do this or found better ways to deal with that heat off the muffler and cat?

 

Yeah I ran into that issue I kinda just left it the way it was...bc it was to expensive for me to buy material to lay on top

 

whats cai?

 

Cold air intake. You can make your own so its not 200+ dollars

 

I have pics in my profile of how to make your own CAI. On the cheap. Works well with exhaust systems BC it improves performance all around

 

time for an all new exhaust overhaul i think... my muffler is hitting my drive shaft. and its leaking. any ideas of what to get?

 

What kind of sound are you looking for and what's your price range?

 

One thing. 3 years ago I put a glass pack on. After that I noticed the mpg dropped a little and it felt kinda like a slug on the highway. Last week my tail pipe broke so I just ripped it off. Idle got more rough.
Had to drive 40 miles home and it was pretty noticeable that it was worse on the highway as far as pick up and mpg dropped further.
Friday I got sick of my XJ sounding mean but going nowhere fast and drinking a crap load of gas. I put a stock muffler and tail on and been driving it like I normally do all weekend on the same tank of gas. Usually I have to fill it up twice. It idles nice and smooth now and it doe's not feel like a slug at 60 mph.

I do however miss the rumble it had cause now it's so quiet all you here is the drive belt turning the pulleys at idle lol
Is there a muffler I can use that will give it some sound back and not take away HP and MPG?