Need4Speed

Those are great results.. Thanks for sharing ...

justinco

Nice numbers indeed!

fstpassat

Nice! My F made 383whp/359wtq(SAE) with just a Joe Z exhaust on a Dynojet 248C. Was surprised as well.

LexISguy

Nice numbers....

RSXiMUS

iTrader: (7)

Nice! Did you get a baseline number?

fstpassat

Unfortunately I didn't. I know another F made a bone stock pull of 355whp on the same dyno, but it wasn't my car and it was on a different day.

fearnight

I have a Borla Catback on the way!

Rickna

iTrader: (3)

I'm sure you'll love it. I had mine installed yesterday.

mkp81

Got mine on a few weeks ago Paid a muffler shop $90 to install. Love the sound. I'm used to a lower rumble coming from chevy trucks most of my life, but it's a nice sound at low RPMs, and super quite with cruise set at 80mph.
Nice to see these numbers!!!!

RSXiMUS

iTrader: (7)

Well it's been over a month since installing the system and I'll tell you guys one thing, it gets much MUCH quieter compared to when it was first installed.

It still has that sweet V8 rumble but just toned down a lot, sometimes I kinda wished it was loud like day one because it just sounded so badass but then I come to my senses and realize I live in **** Cali. Overall it's one of my all time favorite mods, I double checked all the clamps over the weekend and they all seem perfect.

cremaster

iTrader: (1)

if you want more sound, you can always hack off the middle resonator, like i did w/ mine. it's about 30% or so louder and you get a little bit of rasp at the higher rpms. when i contacted borla, they said removing it would not affect the power gains. you'll get a lot more drone, tho. after a year, i want it even louder now haha

Reaper21

iTrader: (1)

^Shoulda just done straight pipes then. Or HKS SSM and Novel headers if money isn't an issue. The sound on that setup is insane.

I was pleasantly surprised when I opened this thread, I didn't think there were gains like this to be had from the Borla. Might have to consider one now.

USB_F

iTrader: (11)

If you want it louder, unbolt the mufflers...it's free.

I did this when I had my Borla, but eventually sold it and picked up a Joe Z. I agree, the Borla gets quieter over time.

Maxxam

Why (how) would the mufflers get quieter with time? I am a master auto tech and have also installed many different aftermarket mufflers on all kinds of vehicle (including Borlas on my Z06). I have never had the db get quieter nor can I fathom mechanically how this could be a possibility.....

RSXiMUS

iTrader: (7)

Don't quote me on this but I read somewhere that it's the new packing material inside the mufflers that "break in" during the initial heat cycles, it causes them to better absorb the sound which in turn quiets them down. The Borla muffler/resonator has several layers of sound absorbing material made from stainless steel and ceramic, other manufacturers like Flowmaster just use chambers and baffles so the sound levels on those types of mufflers shouldn't change over time.

Same thing happened with the Tanabe Touring Medallion on my IS350. First week it was crazy loud and droned on the freeway, after about a month it was almost as quiet as stock.

Maybe somebody who has more knowledge on this subject can chime in.