Borla Cat replacement pipes


HPGT

HPGT

GT Owner
Jul 31, 2012
82
Little Rock, AR
I'm going to install Stillen X(H) pipe, and I also had to check on
my half shaft bolts. I have Borla cat replacement pipes. Now
I'm wondering if I need to wait on the Borla pipes until I check on
the loudness of the X pipes. I know a lot has been posted on X pipes
and loudness - I just thought someone might have knowlege on these 2
brands together - or a thought on the sound insulation of the Borla cat replacement
compared to the stock cats.
 
It is hard to give you a subjective measurement of "loud", but the Borla Cat Deletes in conjunction with an X/H pipe is going to be pretty dang loud. The only "muffling" that you have going on will be the resonator in the Borla pipes and these are quite a bit less restrictive than the OEM CATs. The stock CATs do I surprising amount of muffling. (Note: Disconnect your negative terminal at the battery to insure that you don't accidentally bump the otherwise hot cable at the starter.)
 
Thanks - I think I'll just put the Borlas on the shelf and just do the X pipe for now.
 
My pipes were very loud about two years ago until we discovered a crack in them. A new set eliminated a lot of rattles and noises inside the car. My neighbors love the quieter car. I only feel inadequate when I am around Ed Sims. His make mine sound like a hybrid! LOL.
 
Triheart7 said:
My pipes were very loud about two years ago until we discovered a crack in them. A new set eliminated a lot of rattles and noises inside the car. My neighbors love the quieter car. I only feel inadequate when I am around Ed Sims. His make mine sound like a hybrid! LOL.
Click to expand...

Were the stock pipes cracked?
 
HPGT said:
Were the stock pipes cracked?
Click to expand...
I think it was a Heffner H pipe. Mine had a crack in it too on the bracing connecting the left to right side.
 
Black Ice is correct!
 
I just finished that swap today as a matter of fact. Have had a GTG X pipe for long time with cats. Loved the sound and nice pops and crackles. Removed cats and replaced with the Borla cat-delete pipes. I had the cat-deletes ceramic coated yesterday. Sounds a lot stronger, the healthy pops I used to get are replaced with nice manly bangs now. But overall, it's not terribly louder than the stock cats. I didn't want an ear busting car, just trying to free up a few more horses. Here are the pipes (before ceramic) and after installed. Have to bed in new brakes, so road test tomorrow. Will report back.

cat delete.jpg

exhaust.jpg
 
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Thanks Wwrabbit for the validation. I was beginning question my judgement on the reasonable limits of sound tolerance. I will probably hold back on the Borla pipes until I get used to the X-pipe sound.
It's possible that the ceramic coating might help with the sound - keep us informed.
 
I gave it a good run today. It is for sure a bit louder with the cat-deletes, I'd say by 25-30%, but it has the same character. The ceramic should not have an effect - I did that for heat mitigation. Interestingly, the sound change is in low frequency and with more sound pressure. More things vibrate. Exhaust pops are stouter.Definitely NOT a ball buster on sound, tolerable. And you can always short shift it for stealth. I think I like it, but we'll see. Going to a track end of the week for 3 days- that will tell the tale. Your'e plan seems like a good one, start with just the X-pipe and move up from there. I'll let you know how next weekend goes.

JS
 
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