2013 Sierra 6.2 4x4 thread

nickyreno said:
Here is a dual 3" inlet, single 4" outlet.

http://www.summitracing.com/nv/parts/gib-788050s/overview/

Here are all the dual inlet and single outlet

http://www.summitracing.com/nv/sear...fflers/inlet-quantity/two/outlet-quantity/one
Click to expand...

Since I really want a XR-1 I'll just do duals into a Y then directly into a XR-1.

What's the difference between the multi core and sportsman? Anyone know? Also, any advantages in getting round vs oval? I guessing round is a little louder bc of less stuffing inside?


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GreyGhostz71 said:
Since I really want a XR-1 I'll just do duals into a Y then directly into a XR-1.

What's the difference between the multi core and sportsman? Anyone know? Also, any advantages in getting round vs oval? I guessing round is a little louder bc of less stuffing inside?


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Click to expand...

No difference between round and oval. They are made for cars for clearance issues since its a universal muffler.
Simple google search wouldve brought up your question


I received this response from Borla. In case anyone else is interested.

1. The difference between round and oval mufflers is based around what you can fit, also a round muffler may be a little louder.

2. case size will determine how quiet the muffler is. The general rule is the longer the case size, the quieter the exhaust will be.

3. Multicore’s hence the name have multiple cores and are designed for large racing engines that need to be as quiet as possible without losing performance. Sportsmans are a single core muffler and will be more aggressive than the multicore.
 
gmc00z said:
No difference between round and oval. They are made for cars for clearance issues since its a universal muffler.
Simple google search wouldve brought up your question


I received this response from Borla. In case anyone else is interested.

1. The difference between round and oval mufflers is based around what you can fit, also a round muffler may be a little louder.

2. case size will determine how quiet the muffler is. The general rule is the longer the case size, the quieter the exhaust will be.

3. Multicore’s hence the name have multiple cores and are designed for large racing engines that need to be as quiet as possible without losing performance. Sportsmans are a single core muffler and will be more aggressive than the multicore.
Click to expand...
:shake: thanks grant.


I found a 4" tail pipe section and the 3" Y pipe on summit. Only thing is, id have to figure out a way to go from 3" out the muffler to the 4" tail pipe. Can i get a small piece that goes from 3" to 4"?
 
How much more sound y'all think I'll get with the 3" duals into a single 16" borla then 4" back vs just a single 3 or 3.5" into a XR-1 then out 4" back


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