exhaust question

by **JvR** » Thu Aug 20, 2009 10:10 am

Hi you all,

I have a question about my my exhaust:
my whole exhaust needs to be replaced.
So in September, a guy is going to weld and install the new exhaust.

I already have the OBX header + y-pipe and metal (header)gaskets.
He is going to weld on the y-pipe a performance catalyst and a nut for the o2 sensor.

-I asked him to use 2.5" pipe.....i don't know if that is the right size?
-I'm going to ask him to weld a extra nut for a a/f sensor...i don't know the right spot?
-Is there something i also need to ask him?

Thanks a lot! :wnw:

I forget to mention i drive with a s/c :morning:

by **akora12** » Thu Aug 20, 2009 10:25 am

2.5" will be fine. A 3" exhaust would yield maximum performance since you're boosted, but there's usually a trade of hp for torque.

As for the a/f bung, it needs to be before the cat in the y-pipe. Make sure it's mounted at an angle as well.

by **jetbtkng** » Thu Aug 20, 2009 11:46 am

3 in is the only way to go, im making 284.5 hp, and 270 fpt, with the obx complete exhaust, no cats, that was with stock air intake, manual tranny,

, and bbq bobs camry auto same exhaust,

.................... :drinking:

by **JvR** » Thu Aug 20, 2009 3:54 pm

thanks you both.

-The OBX piping is 2.5 inch , so why go bigger?

thanks again!

by **akora12** » Thu Aug 20, 2009 4:06 pm

The OBX cat-back is 3".

by **SpeedySolara** » Thu Aug 20, 2009 4:09 pm

jetbtkng wrote:3 in is the only way to go, im making 284.5 hp, and 270 fpt, with the obx complete exhaust, no cats, that was with stock air intake, manual tranny, , and bbq bobs camry auto same exhaust, ....................

Frank did you measure your OBX headers and y-pipe? I heard they were 2.5" and I didnt believe it until I actually measured mine and the inside diameter was in fact 2.5" although OBX marketed it as a 3" pipe. By the way, I have the newer design OBX pipe. Great numbers regardless.

by **SpeedySolara** » Thu Aug 20, 2009 4:11 pm

akora12 wrote:The OBX cat-back is 3".

Frank, forget I asked...Ryan gave me the answer lol.

by **jetbtkng** » Thu Aug 20, 2009 4:11 pm

obx is 3 in, and if your sc'ed you want 3in exhaust, because your forced air inducted, you want it to flow freely................ :drinking:

Website · by **99BlackSandv6** » Thu Aug 20, 2009 4:23 pm

I swear Frank you have that chart in at least a dozen threads...c'mon.

On topic, I agree with everything everyone else said so far. Good Luck.

by **jetbtkng** » Thu Aug 20, 2009 4:58 pm

well i went through a bunch of >>I'm a douche<< here over these #'s, so any time i post hp #'s, i back it up with proof, its needed here.................... :drinking:

by **Midias** » Thu Aug 20, 2009 6:07 pm

SpeedySolara wrote:diameter was in fact 2.5" although OBX marketed it as a 3" pipe. By the way, I have the newer design OBX pipe. Great numbers regardless.

It was only marketed as 3" for a short time then the listing was later changes. Somehow the 3" persisted probably because of the catback.

by **JvR** » Thu Aug 20, 2009 11:50 pm

So what do you think :lol:

:
top=inch
bottum=cm

It is less then 2.5 inch..... so 2.5 inch will be enough?

by **Midias** » Fri Aug 21, 2009 4:50 am

2.5 will be fine SCed Dat was running 2.5 no problem. A three inch catback with that header will give more power proper tuned but it is not necessary.

You could also import the 3" OBX catback but it may be expensive.

by **JvR** » Fri Aug 21, 2009 5:19 am

Sorry (my english is not so good) but a catback is the last part of a exhaust? (what you see at the back of the car) :oops:

I get a dual exhaust

by **Midias** » Fri Aug 21, 2009 5:22 am

JvR wrote:Sorry (my english is not so good) but a catback is the last part of a exhaust? (what you see at the back of the car)

I get a dual exhaust

are you getting 2.5 inch dual exhaust?

The catback is everything after the catalytic converter back all they way to the exhaust tip.

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