This may be a stupid question, but I have a question about bypass pipes. I've heard of two different kinds 1) cat bypass 2) muffler bypass.

Now i understand the concept i.e. what is being bypassed, but does anyone know of the difference in sound, HP+, or CEL errors between the two types?

Thanks in advance.....and merry christmas

 

cat bypass: definetly cell... muffler bypass:no cell don't know too much about hp gains though...but probably very minimal...

 

any thoughts on loudness/sound???

do you think the hp increase w/ muffler bypass would be equiv to that of an upgraded muffler?!?

 

I think muffler bypass pipes would be VERY loud. Probably too loud for the street or daily use, but to each his own.
Merry Christmas.

 

If you want to know loundness/sound, Take off your muffler, that essentially is a muffler bypass.

 

if you do a cat bypass w/ stock muffler, it's not too bad(still loud), but with the muffler bypass w/ stock cats, it's a bit louder...for me, I think it would just be best to get light weight mufflers and 200 cell cats....you'll probably get some hp...

 

the reason i ask is because i just installed the Agency Power exhaust that vivid sells and im not overly impressed. I was hoping for something a little "throatier". i did drive around for awhile with the mufflers off. I thought the sound was awesome, but quite a bit too loud. if i could get the same sound as mufflers off but 50% as loud....that would be perfect.!!!

 

well with a 200 cell cat might change things...but I heard sound clips of the Cargraphic exhaust(export loud) and though it sounded amazing...check it out....

 

The PSE is louder than the AP mufflers. However they are more expensive. Have you checked out Fabspeed?

 

I've never had a CEL in my car. If one were to go w/ a cat bypass setup is the cel a major problem...like flashing lights or will it mask any future CEL's that may be important??

 

I've looked into fabspeed a little, the problem is I live in the middle of michigan and there aren't any porsches for 500 miles, so i cant listen to anyone elses setup...only online videos. Which after listening to a few i thought AP was the way to go.....? I may have to listen to the ghl setup though...do they have any sound bites?

 

I think Eli has GHL exhausts on his car, maybe he can provide a soundbite. When we do the run to CC next Saturday hopefully we can get some clips for you.

 

+rep just for proposing the idea

 

I have the Fabspeed headers & mufflers. Before I installed I thought I will get noticeable sound from the Fabspeed. After the installation and driving it for about 400 miles now I still don't think it's much different than stock, except above 5K rpm the sound a little louder than stock. My cousin has GHL exhaust, we did some comparisons and the result shown that GHL has higher pitch, Fabspeed has lower tone.

I am thinking just for the fun of it maybe I take off the mufflers and hear what it sounds like.

 

It sounds awesome...just really really really LOUD (harley loud). when i had mine off i took a cruise around town and it turned almost every head, even some people in cars turned to look. lol got quite a few thumbs ups and waves though

You wont like it for long though...its really loud.

I tell you what would be awesome is something like capains call on a boat where you can push a button that switches from muffler bypass to say PSE or even stock!?!?