2.5" or 3" Exhuast?
- Thread starter 1sty
- Start date
Hey
If we are talking Na there is no reason to go as big as 2.5-3.0 inch exhaust its just simple too big i.e. not enough back pressure and u will actually be losing horses. Now if we are talking boosted then at all means u need the least restictions of back pressure and thats why u need up to a 3.0 inch exhaust like that of Terry's MP3 aka Spoolin'. Ummm To answer ur question i don't believe there is a company that makes exhaust that big for our cars but u can get some exhaust piping get it mandrel bent and and take out the second cat and take out the resonator then u got urself a nice custom exhaust that sounds great. Largest u should go NA is 2.25 or 2 and a fourth inch( however u wanna say it) piping for exhaust.
Peace,
Zane
If we are talking Na there is no reason to go as big as 2.5-3.0 inch exhaust its just simple too big i.e. not enough back pressure and u will actually be losing horses. Now if we are talking boosted then at all means u need the least restictions of back pressure and thats why u need up to a 3.0 inch exhaust like that of Terry's MP3 aka Spoolin'. Ummm To answer ur question i don't believe there is a company that makes exhaust that big for our cars but u can get some exhaust piping get it mandrel bent and and take out the second cat and take out the resonator then u got urself a nice custom exhaust that sounds great. Largest u should go NA is 2.25 or 2 and a fourth inch( however u wanna say it) piping for exhaust.
Peace,
Zane
hey go the cust route...go to an exhaust center...midas or some other performance shop and have them bend u an exhaust with i would say 2 3/4-3"...make sure it is mandrel bent....so there is no crimps in the exhaust....it should cost u no more than like $150...it only cost me 100 for 2 1/4...but hey that is NYC for u too...hehehe
Hey
Well then like i said u need to get a custom one done. Get a full three inch (make sure they mandrel bend it) and get a free flowing turbo muffler. and u got urself a nice exhaust. The three inch plus mandrel bend should cost u less than two hundred and then the muffler will cost u three hundred or less depending on what company u choose from.
Hope that helps.
Peace and have a great day,
Zane
Well then like i said u need to get a custom one done. Get a full three inch (make sure they mandrel bend it) and get a free flowing turbo muffler. and u got urself a nice exhaust. The three inch plus mandrel bend should cost u less than two hundred and then the muffler will cost u three hundred or less depending on what company u choose from.
Hope that helps.
Peace and have a great day,
Zane
- :
- Black tinted '02 P5
$1000???
i would never spend a grand for an exhaust system! straight back thats what i say! lol
i would never spend a grand for an exhaust system! straight back thats what i say! lol
Youngblood
Member
Will getting a 2 1/4 exhaust change the sound Im guessing that it would. And how about performance? I used the search but nobody gave the answer I was lookin for. Seems like they were unsure
Thanks
Thanks
I'm not trying to step on toes here, but if you have an otherwise unmodified car, dont expect too much. The mazdaspeed exhaust (according to dynos on this site) gave between 4-6 horsepower with the Injen intake, and 3-4 alone. You probably will not get more HP from putting larger piping on a N/A motor, as there is little restriction (other than the non-mandrel bend) in the piping itself, rather it is in the cats and muffler.Youngblood said:Will getting a 2 1/4 exhaust change the sound Im guessing that it would. And how about performance? I used the search but nobody gave the answer I was lookin for. Seems like they were unsure
Thanks
Even on a F/I car (Here I use FM's turbo protege dyno's), they only got 16 hp (which is a lot, but not life changing) from a better exhaust.
If you're putting a "performance" exhaust system on an otherwise unmodified car, you'd better be doing it for looks and sound, 'cause the huge performance jump just aint there. And as mentioned, above 2.25 on a stock motor and you lose torque.
Performance,Sound
Yeah the only way u will get performance out of this change or atleast around 7-9 hp is gunna be to chunck the second cat and resonator then u will have a cool sounding exhaust that is worth it cuz u also get power. Sorry i didn't say that before it just seems to be a given to me.
Peace,
Zane
Yeah the only way u will get performance out of this change or atleast around 7-9 hp is gunna be to chunck the second cat and resonator then u will have a cool sounding exhaust that is worth it cuz u also get power. Sorry i didn't say that before it just seems to be a given to me.
Peace,
Zane
Youngblood
Member
I thought if we lose the second cat then we would have no "back pressure" and then we would lose power. PLEASE HELP me understand this before I do something wrong!! (scratch) (bluemp3)
If you lose the second cat, you'll be fine. Your car wont register that big on the butt dyno that's all, but you'll gain better flow up top where we need the power the most. Don't get too caught up in the "back pressure" hype as it's not all it's cracked up to be. Rule of thumb......for NA apps, retaining some back pressure is recommended for cars with very little torque. Since our motors are pretty torquey compared to other 4 cylinder 2.0 liters, I think we can get away with losing a cat and the resonator. For Turbo apps with a, small turbo, you'll want to remove the cats and resonators for better top end flow and since you're turbo'd, torque isn't a problem. With a big turbo, you'll want to keep one of the cats to keep some of that back pressure for slightly quicker spoolup.
Of course, these are just my thoughts and some what I've read. It's come to my understanding that these rules mainly, only apply to optimal street driven cars. And of course, as always.........each to their own.
Of course, these are just my thoughts and some what I've read. It's come to my understanding that these rules mainly, only apply to optimal street driven cars. And of course, as always.........each to their own.
Yeah and ummm Yeah...
Apexistud is right on the money. Very well put. The only change i will throw in from my side is i do believe that on ur butt dyno u should actually feel an ok diff nuthing out of this world so to say but u should feel it.Ummm and with the 60mm that is a to be seen but doesn't the Racing beat exhasut have a cat and resonator still???? Bt even taken off i thnk u would still lose some down low but u would gain sumi the upper revs. Which like Apexistud said is each to their own depends on what u are looking for.
Peace,
Zane
Apexistud is right on the money. Very well put. The only change i will throw in from my side is i do believe that on ur butt dyno u should actually feel an ok diff nuthing out of this world so to say but u should feel it.Ummm and with the 60mm that is a to be seen but doesn't the Racing beat exhasut have a cat and resonator still???? Bt even taken off i thnk u would still lose some down low but u would gain sumi the upper revs. Which like Apexistud said is each to their own depends on what u are looking for.
Peace,
Zane
