SW Headers sound question

Hey all,

I have the SW LT (w/cats), a borla exhaust turned down after the axle and an SVC tune (which causes higher RPM starts). My concern is that I get some serious blatting noise on startup when cold. anyone got any ideas on this? do I have a leak or loose fitting somewhere, or is this pretty much normal?

https://youtu.be/_MVhiI_heuQ

Sounds similar to when I had the SW s-tube mufflers... just changed them to different mufflers and it is still there but a little more muffled. Yours seems to be a little louder than I remember, but that may be with the Borla design too.

it is really loud. past cold start ups it's fine, it's just when the engine is cold.

ducatisps said:

it is really loud. past cold start ups it's fine, it's just when the engine is cold.

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Yeah, it would be worth checking to ensure no exhaust leaks. However, mine does that for about 25 seconds or so and then it quiets down a bit (now quieter with the new mufflers).

Side note: I put Dynomax VT mufflers on and it is much quieter at idle and no drone at cruising speeds (turn-downs off the mufflers). But when you get into 1/2-WOT it screams just like it did before.

other than this startup issue the borla doesn't really drone at highway speeds, from about 1/2 throttle up it's really freaking loud (I have the entire interior sound killed).

i know getting rid of the turn down will quiet it down quite a bit, but I hate having exhaust tips hanging out where they can get crushed when I play a bit too hard.

Yup, I won't go back to an exhaust tip. Love the turn-downs. I'll be sound deadening the cab sometime in the near future. But, the sound of these trucks with headers is ridiculous... it just screams. I love it.

Mine does the same thing, I have the sw full system headers, cats, and mufflers out the back under the bumper. sounds weird on start up. got used to it now, I have the chambered mufflers.

Mine does the same thing as well. My neighbors love me in the morning. I have SW LT headers, Corsa Sport exhaust, and SVC tune. I am considering getting rid of the cold start option.

I also have a lightning style exhaust exit right behind the backdoor on the passenger side. It's loud in the cabin at WOT. Towing trailers up hills on the freeway is super ******* annoying. I am probably going to change to a turndown style.

@ducatisps your's is blatantly loud. I have no cats and an MBRP turndown clocked to the 5 o'clock position that in my opinion is not as loud as your's. I did notice however that when I went down to sea level it had increased.
@factive, I didn't know you had longtubes. Thinking about running around the UTTR soon if you want to get out. You can also hear a turndown option.

The Macf said:

@ducatisps your's is blatantly loud. I have no cats and an MBRP turndown clocked to the 5 o'clock position that in my opinion is not as loud as your's. I did notice however that when I went down to sea level it had increased.
@factive, I didn't know you had longtubes. Thinking about running around the UTTR soon if you want to get out. You can also hear a turndown option.

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sounds like a great license plate: BLATANT