ZombieSoldier

My whole exhaust is just about dead. its rusting, it leaks, and sounds horrible. So I am planning on replacing pretty much the whole exhaust. It will go to a local muffler shop for the actual install. but here is what I am planning:

2.25" piping
2.25" thunderbolt high flow converter
2.25" Borla ProXS muffler
then top the setup with a decent stainless steel tip

What do you guys think? Think it will sound ok and perform ok?

jeffcycles

Why wouldn't you just go 2.5" all the way back?

ZombieSoldier

It was recommended to me to do 2.25" due to that is more than enough flow for a stock 4.0, as there is no lose in low end torque. I am not against a 2.5" if i can find enough proof to warrant stepping up to it.

Crazy 8s

If you are going to do something nicer like Borla in stainless steel, you might as well just get the 2.5". It may not yield a big performance gain but it won't be a big price gain either. It would be a bit heartier sounding too.

ZombieSoldier

good point.....

mschi772

2.5" on a 4.0 can result in decreased power in the lower RPM's (where the 4.0 actually runs in real-world situations) and gains in high RPM's (that the 4.0 rarely, if ever, sees).

2.25" is ideal unless something like a 4.6+ stroker is in your future.

STUD IN THE MUD

If your going to go all out you might as well do a header. It would really compliment these upgrades nicely and would give you the biggest performance gain. If anything you can get an upgraded APN brand manifold for 120 bucks.

ZombieSoldier

what is a decent header brand? doesnt have to be great.. i mean i am seeing them on ebay for like $100, but IDK if any of them are worth a damn.. for eaxample

http://www.ebay.com/itm/1991-99-Jeep-Wrangler-Cherokee-Polished-Header-4-0L-/400224988788?fits=Make%3AJeep%7CModel%3ACherokee&hash=item5d2f44ae74&vxp=mtr

mschi772

APN is a fantastic low-cost header.

And if money is no object, either a Borla header or a Thorley header imo. Add Brown Dog motor mounts and a new trans mount to the list in this case in order to protect your new header from cracking.

ZombieSoldier

damn my little project price keeps going up and up and up, LOL

ZombieSoldier

looks like I am putting that APN header on the list as well... damn... LOL. Guess I gotta figure out the header down pipe that leads to the cat, since I am replacing the rest of the exhaust gotta figure out a replacement for that since I am already doing an upgraded cat.

peep

Basic plans will have base prices.
As you are throwing the Borla name around, good quality, up the budget pricing.
As you are considering header, up the budget pricing.
High flow cat, up the budget pricing.
As a muffler shop will be involved with the install, up the budget pricing.
This thread is in the modified section, modified?, up the budget pricing.
I think your selections are very good, 2.25 is good for the 4.0, would back that APN header also.
With projects, good, cheap, quick, pick two. If the bank is good, go for it.
If the budget should be redirected, a solid stock system can keep you going for a couple more years.
Lookin forward to your end selection.

ZombieSoldier

actually besides the header, I can do this whole thing for $250 including the muffler shop

s346k

I've gone full circle with exhaust replacement. mine is in bad shape. I think I am going to simply replace it back to stock and leave it be. it is loud now and annoying. I miss my quiet exhaust.

ZombieSoldier

what did you have on yours?