Tomei expreme flange diameter question
Tomei expreme flange diameter question
Hey!
I just got the AMS downpipe and high flow cat, both of which are 3", and I also got the Tomei expreme cat-back. The later has a pipe diameter of 3", but for some reason, the diameter of the flange is 2"3/4 ?? Look at the pictures I took next to the AMS HFC...
Is this normal? the bolt patern does fit on the AMS HFC, but this will be restricting the exhaust flow.
I just got the AMS downpipe and high flow cat, both of which are 3", and I also got the Tomei expreme cat-back. The later has a pipe diameter of 3", but for some reason, the diameter of the flange is 2"3/4 ?? Look at the pictures I took next to the AMS HFC...
Is this normal? the bolt patern does fit on the AMS HFC, but this will be restricting the exhaust flow.
Not sure I understand why they would do such a thing for an evo x exhaust... 
Even the Tomei test pipe has a 3" diameter... Why would Tomei taper their exhaust?? So it fits on the OEM cat? That's BS, who keeps their OEM cat anyway?
Even the Tomei test pipe has a 3" diameter... Why would Tomei taper their exhaust?? So it fits on the OEM cat? That's BS, who keeps their OEM cat anyway?
I wish I could change the thread title to "Tomei expreme catback not a true 3" exhaust" to warn more people about this. Can a mod do that please?
If I had known, I'd probably have bought the AMS single exit exhaust.
I tried to find this info on vendors' websites and it doesn't mention it anywhere. Not even on Tomei's own website.
I'm disappointed. Other than that though, it's a really nice exhaust and light, too.
If I had known, I'd probably have bought the AMS single exit exhaust.
I tried to find this info on vendors' websites and it doesn't mention it anywhere. Not even on Tomei's own website.
I'm disappointed. Other than that though, it's a really nice exhaust and light, too.
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Newbie
Joined: Aug 2010
Posts: 67
Likes: 0
From: warner robins
They taper it so they can fit the OEM cat and yes people do keep this. A lot of cars are strictly regulated for emissions so they have to keep the stock cats. Another thing is the tomei is technically not a 3 inch exhaust it is an 80mm but the difference is so small its just listed as the equivalent of a 3 inch. Lastly there is no sense in complaining when your losing 40 freaking pounds the loss in that horsepower would be far over shadowed by the fact that you just lost all that weight, I would take 100 pounds off a vehicle far before i took 5 more horsepower.
It all comes down to the engineering of the exhaust system as a whole. Your gaining 20hp and losing 40 pounds. Thus your car will essentially be faster in theory. Just enjoy the car with the exhaust you have. The best exhaust on the market IMHO for the Evo X.
It all comes down to the engineering of the exhaust system as a whole. Your gaining 20hp and losing 40 pounds. Thus your car will essentially be faster in theory. Just enjoy the car with the exhaust you have. The best exhaust on the market IMHO for the Evo X.
they taper it so they can fit the oem cat and yes people do keep this. A lot of cars are strictly regulated for emissions so they have to keep the stock cats. Another thing is the tomei is technically not a 3 inch exhaust it is an 80mm but the difference is so small its just listed as the equivalent of a 3 inch. Lastly there is no sense in complaining when your losing 40 freaking pounds the loss in that horsepower would be far over shadowed by the fact that you just lost all that weight, i would take 100 pounds off a vehicle far before i took 5 more horsepower.
It all comes down to the engineering of the exhaust system as a whole. Your gaining 20hp and losing 40 pounds. Thus your car will essentially be faster in theory. Just enjoy the car with the exhaust you have. The best exhaust on the market imho for the evo x.
It all comes down to the engineering of the exhaust system as a whole. Your gaining 20hp and losing 40 pounds. Thus your car will essentially be faster in theory. Just enjoy the car with the exhaust you have. The best exhaust on the market imho for the evo x.
I can't wait to see it installed and hear how it sounds like
Its going to sound great. I have two friends that have this exhaust and I think its the best sounds single tip set up.
Newbie
Joined: Sep 2012
Posts: 17
Likes: 0
From: Norcal
They taper it so they can fit the OEM cat and yes people do keep this. A lot of cars are strictly regulated for emissions so they have to keep the stock cats. Another thing is the tomei is technically not a 3 inch exhaust it is an 80mm but the difference is so small its just listed as the equivalent of a 3 inch. Lastly there is no sense in complaining when your losing 40 freaking pounds the loss in that horsepower would be far over shadowed by the fact that you just lost all that weight, I would take 100 pounds off a vehicle far before i took 5 more horsepower.
It all comes down to the engineering of the exhaust system as a whole. Your gaining 20hp and losing 40 pounds. Thus your car will essentially be faster in theory. Just enjoy the car with the exhaust you have. The best exhaust on the market IMHO for the Evo X.
It all comes down to the engineering of the exhaust system as a whole. Your gaining 20hp and losing 40 pounds. Thus your car will essentially be faster in theory. Just enjoy the car with the exhaust you have. The best exhaust on the market IMHO for the Evo X.
Evolving Member
Joined: Jul 2011
Posts: 489
Likes: 1
From: Edmonton, AB
I cant believe people were saying "thats why im staying away from the tomei exhaust, because its taper 1/4 of an inch" wow really? You wont even notice 1/4 differene in diameter. I'll take loosing 36lbs from the exhaust over a 1/4" taper any day.
