Jump to content

New (custom) exhaust for my SS...

Recommended Posts

Hey guys...


First off...Merry X-mas (eve), happy holidays!


Wanted to post pics of my new exhaust. I didn't plan on doing a catback on this truck, but I had an unused Magnaflow muffler laying around from an old project, and realized that for $75 for another matching muffler, I could get a few ponies, and a great sound out of my 6.0...


I used two Magnaflow mufflers (2.5" offset in / 2.5" center out - p/n 12256), an H-pipe before the mufflers, modified the stock Y-pipe, and the rear piping and tip.


(I did all this in my garage with a Lincoln 135 wire-feed welder, flux core wire...so excuse the semi-sloppy welds on a few of the pipes..and they look even more funky b/c I hit them with high-temp, shiny AL paint)


I wanted to keep it cheap, so I settled on a homemade H-pipe, rather than make a more complicated Y.


Started by cutting off the stock muffler,and put in the H-pipe:




Then welded on the 2 mufflers:




I drove it like this for a day, with just dumps after the muffler...and hated it. Noticeable loss in low end, and bad resonance in the cab at idle and up to ~2000rpm... Sounder GREAT at WOT, but too loud for my tastes (it really wasn't that bad, but I wanted quiet, with just a little more rumble than stock)...


So I took the stock Y-pipe and made it a more "true" Y...for better flow, better merging of the exhaust gas. Welded that to the muffler exit, made a 3" intermediate pipe to connect it to the stock rear piping:




The low end grunt was back, and the sound better IMO...


I wanted the tip to sit a little higher, so I bent the hanger up a little, to make it sit a little closer to the body:




And finally, and outside shot:




- - - - -




Awesome sound. Deep and mellow, maybe a little resonance between 1500-1800rpm...but a great rumble at idle, and it seems quicker in the higher RPMs (?).


Overall, I'm really happy with the outcome, sound and performance.


This is a great mod for these trucks IMO (and even better for the $75 I have invested in it)...although it did take ~5hrs of playing around / cutting / welding to get it *just right*.


Anyway, have a good holiday...


- Brian

Link to comment
Share on other sites

...did this in my driveway with a flux core welder.  I feel your pain.  I really need to get the gas add-on for it  and get off the flux.


Hehehe...me too.


My welder came with the gas kit (reg, hoses, etc...), but I have yet to buy a bottle for it!!!


It does the job, but it's not pretty.


Thanks for the compliments...


- Brian

Link to comment
Share on other sites

I had some good gains. I replaced the front pipes at the same time. I didn't put the cats back on. It made the stock muffler sound real good. I had more compliments with that setup than I have with my flo-pro muffler I have now. I didn't gain much with the flopro over the stocker.

Edited by BigTex (see edit history)
Link to comment
Share on other sites

A few thoughts, after putting ~400 miles aon the truck after putting on the exhaust:


Power: Seems great...much improved on the top end (3000rpm and up). With the stock tailpipe, the low end feels the same (much better than with the dumps)...


Gas mileage: Same style driving, I saw a 1mpg improvement (50% city, 50% highway @ 80-85mph = ~14.2mpg now)


Noise: Sounds AWESOME at startup and idle...nice and deep tone. Drones a little as you start off, until ~2100rpm...then it's barely louder than stock. Once I hit ~55-60mph, it's bad once it shifts to 4th - Lots of resonance in the cab. If I drop it into 3rd and bump the RPM over 2100, it's quiet again.


That's my only complaint - A little annoying resonance in the low RPMs. Other than that, it's GREAT.


- - - - -


So that brings me to a question: Has any one else noticed their exhaust has "broken in" and quieted down a little? Mine was more loud for the first few drives, now it sems to have mellowed out and gotten "smoother" now...


I know that mufflers burn off some of the outer sound deadening material, I assume this change is related to that...


Any input is appreciated...


- Brian

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...