So my question is a little strange... When i had my 240sx with a N/A ka24de i ran a 3 inch exhaust back from the header, reason being is that those motors loved the flow of 3 inch, and it helped cool the motor off when i was running autocross and gymkhana. Anywho now to my question... Does the 2AZ-FE benefit from 3 inch exhaust on an N/A motor, or does it kill low end power?

 

From what I've read, there's no reason to go 3" on an NA tC. If you were turbo'd, maybe.

 

a 3" on a tc is only good for 300+ hp. i would suggest a 2.5-2.75 exhaust

 

but the ptuning exhaust is soooo nice..

 

thats what i am thinking , but i was n/a on a 240sx and the ka24de is a whole different animal, its a truck motor!

 

not turboing a 240

 

well i had al all motor 240 then the motor popped then i went ca18det.... this was prior to my honda days

 

If you're staying n/a there's no reason to go any bigger than 2.25".

Going bigger will not give any top-end gains at the tC's n/a HP level, and you will definitely sacrifice low-end torque ... there are plenty of posts on SL about folks with a full 2.5" exhaust losing their low-end grunt.

 

n/a tc = about 30 hp gain if that lol