Cat Back on '04 Expy
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Senior User
Joined: Aug 2004
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Cat Back on '04 Expy
Has anyone here done a 3" cat back system on their '03 or '04 Expy? If so what was the cost and how was it done. The reason I ask is that my local shop is saying that it's a system that has to be ordered because of a tight spot by the rear suspension. They are quoting $500-$600 on it because it can't be fabricated in house. What do you think? Also, what performance gains did you notice, if any? thanks
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
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From: Washington State
Why not just swap mufflers?
Cat back systems usually don't provide any substantial gains versus just a muffler swap.
In the case of the 03+ Expy, full on cat backs are still somewhat rare. Plus, the OEM is actually fairly good stuff. It'll last the life of the truck.
I'll give you one suggestion to add a somewhat custom appearance...Paint the exposed pipe black and throw on a nice chrome tip. That's what I did. The new muffler will go on later this month if I ever get the darn thing out of the shop!
Cat back systems usually don't provide any substantial gains versus just a muffler swap.
In the case of the 03+ Expy, full on cat backs are still somewhat rare. Plus, the OEM is actually fairly good stuff. It'll last the life of the truck.
I'll give you one suggestion to add a somewhat custom appearance...Paint the exposed pipe black and throw on a nice chrome tip. That's what I did. The new muffler will go on later this month if I ever get the darn thing out of the shop!
Freshman User
Joined: Jan 2003
Posts: 32
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I put a Gibson catback on my 03 expy. The 03 catbacks cost a little more than the previous generation. The 03 systems bolt on to a flange and have a 12" flexible section of pipe. I don't feel any hp gains. I think I might have picked up 1mpg freeway but didn't recored enough previous install to be sure. It's louder thank stock. Drones a little at 65 but gets better at 70. Probably not worth the money.
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