3/4 454 suburban exhaust, modify factory or strip to new!

[txaggie]

Howdy all!

I have a 454 suburban I’m messing with and we are about to put headers on it. It came equipped from the factory with dual exhaust no cats and some heat shields on the pipes 2.5” in diameter. When the exhaust hits the mufflers it pivots to 2.25”. One of my techs thinks it will be easier/cheaper to modify the factory exhaust, cut the heat shields off, h pipe it, and weld Flowmaster 50 series 2.25 in the place of the factory muffler.

My thought is to scrap the whole pipe system and put on 2.5 front to back with some Borla xs pros. Thoughts?

Dual Exhaust Kit 2.5" Borla Pro XS Side Exit Fits 81 to 87 GM C/K 20 3/4 Ton | eBay

<p>This kit for your OEM to higher horsepower set ups. The 2.5" pipes are aluminized to increase the life and mandrel bent which is sure to increase exhaust flow, change the exhaust note, and boost performance! The exhaust pipes exit the side of the truck behind the rear tires. *Product...

www.ebay.com

 

[Grit dog]

Interesting options.
Depends how solid the old pipes are and cost to do all the modifications.
IMO calculate both options completely as it may cost as much or more to mod a set of 30+ year old exhaust pipes.

 

[Confused]

If you have good 2.5 pipes to tie into then why not use them? I could see doing some 2.5 mufflers and tailpipes if it were mine. Of those two choices I like Borla Pro xs better. I have run them on a supercharger 4.6 mustang and have them on my big block Duster currently.
I would look into a longer case muffler than the typical 14" case length since you have plenty of room.I like quieter better than louder and longer mufflers help in that area. Old man disease rearing its ugly head again.

 

[txaggie]

Being that we got new headers going on, it makes since to put new exhaust on all the way. Kit in bound

 

[idahovette]

Musta had 'em ordered before you asked??

 

[txaggie]

Musta had 'em ordered before you asked??

And now the order is cancelled. The eBay seller got back and the kit being offered is only mufflers and pipe back. This doesn’t do much for me.

 

[Confused]

Going to need a muffler shop to connect the headers to any mid pipes. The kit is still useful if that is the one you want. Not much bending up front so less chance to crimp pipes too much. Nice mandrel bent tailpipes are a plus.