DIY Exhaust Mod – Gain of 10+ HP!!!

[clb0099]

do u have a clip of how they sounded.. and i am doing the pedro mod myself ..

[23109VC]

I'm impressed - you installed headers, then took them off and resintalled - all in a day. not bad!! I think that is a job that is over my head.

well I took the plunge and I drilled into my muffler and did the "crios" mod.

I just took it out for a quick spin but didn't have time to take any video. My initial impression is that it is a little louder/ throatier at upper rpm, and a little louder at full rpm. I notice more of a change at low rpm than I do at higher rpms. overall the change is not drastic.

I will drive it around like this for a week and see what i think. It was pretty easy. the drill only took about 10 seconds to punch trhough each side. I started with a small bit - a 3/8" and honestly - nothing changed. that hole was too small to notice anything. I then used a 1/2" bit and opened up the smaller hole into a 1/2" hole. when I fired it up after THIS hole, then I noticed a louder sound at idle. at low rpm....you notice it's throatier. like if you were just rolling through a parking lot, you can tell there is a bit more depth to the sound.

immeidately after I did this, and I took it out for an initial spin - one thing I immeidately noticed was the possible thought that i lost low end..... I can't say for sure, but I am wondering if I lost a bit low low end power by doing this.....it may just be all in my head, because of people saying how a high flow exhaust can cause you to lose low end...but one of the first reactions I had as I drove away froma stop was "did I lose soem low end power"....so the next few turns I took, i hammered the gas, and I can't say that I thought it was any slower...

it clearly is NO faster...and I don't think it's any slower....but can anyone suggest their thoughts - could this mod cause you to LOSE low end power?

I'll drive it around for a week - see what I think. I figure if I hate it - I can always tell my wife I broke the muffler and now I NEED to buy afull Fabspeed sytem...

hahahahhhahhha.

i htink she'll tell me to just sell the car... .

[crios]

Without a Dyno, it would be very hard to notice a loss or gain.

To me, my car seems "faster" as it is simply "louder".

I'm into enjoying the way my car sounds and drives around curves, and not so much the actual seconds it takes from 0-60 mph. If this was my concern I woundn't have a spare tire, heated seats or a Bose system in the car

My suggestion, if you like the sound then enjoy the mod. :dance:

Some more sound clips, theses taken with professional equipment:

http://www.ppbb.com/boards/ppbbphp/showflat.php?Cat=&Board=ARCHIVES&Number=1480272

[George in Plano]

What happens if you drill straight back and only penetrate the relatively narrow space of the central outer shell, missing the inner metal tubes? The result is an opening both through the exhaust tips and at the rear outer casing of the muffler.

Good? Bad? Little or no difference?

[clb0099]

I have opted to do the pedro mod on my exhaust..... i like the sound it gives the car.. since i am spent so much money on mods of my car I figure while it is dismantled to just get it done they way i like it so i am happy with it.

[23109VC]

Originally Posted by clb0099

I have opted to do the pedro mod on my exhaust..... i like the sound it gives the car.. since i am spent so much money on mods of my car I figure while it is dismantled to just get it done they way i like it so i am happy with it.

I did the Pedro exhaust to my car - by buying a muffler that already had it done.

I had a pretty bad exhaust leak that was just fixed today - so in the next day or two I'll shoot some video of my car and post it to see what you all think. just before putting the pedro muffler on - I did the crios mod by drilling two 1/2" holes. I think the pedro muffler is a bit louder and it has a different sound. both were good. I would have to hear them side by side to say which I like better...

I think I might like the $2000 fabspeed system more... but my wife won't let me spend that much!!

seriously - I think both mods are good - i'll post my clips later and you can all be the judge.

one thing I notice is that at higher rpms/speeds - I think I hear the intake more than the exhaust. i'll bet an evo intake would sound awesome.

[tamarsha]

I was just about to do the Pedro mod but my exhaust man and I started to get nervous about how close the pipe would have to be to the bumper. I had just deiced to save my coins for an aftermarket exhaust when I saw this mod.

Has anyone ever tried to bypass the secondary cats with… oh… say a piece of rebar or some ridged conduit? I have heard people talk beating the hell out of cats to break them up and create more flow. I wonder how hard it would be to ream out the secondary cat.