I am about to purchase the Dynomax ST muffler for my '04 and I was wondering a couple things.

1. On my Blazer the stock is... inlet - 2.5" OD and the outlet - 2" OD. Would it be best to purchase the O/C muffler with 2.25" openings just to keep it right at the average? Like would this be the best for easy install...slipping the pipes over one another?

2. Should I run my 2" tail pipe all the way out or expand out to a 2.5"?

Any help is appreciated!
Thanks

 

You can run 2.5" all the way from the muffler to the tip. It will change the sound. If you were to reuse your tail pipe, get a 2.5 inlet/outlet muffler then get a 2.5" to 2" adapter. You will have more room at either the front or the back of the muffler as the stock muffler will likely be a lot longer than your replacement.

*Moving to Headers, Intake, & Exhaust*

 

Should I run the 2.5" straight out then? Is that the way to go?

Is there going to be a difference in sound and/or performance?

Thank you very much!

 

I believe keeping the same size pipes throughout the whole line is better for performance. Slipping the pipes over each other sounds easier, but I'm not sure, and i don't think that would be good for performance. I say you should weld the pipes