munna

Hi took my car to the garage this morning(98Terzo)to see what size pipe i would need for a de-cat downpipe,it seems that the car is running from the front to the back,pipework that is 4" s in thickness!

Silly question but does that mean that the de-cat that i will need to buy needs to be also 4"?Or can it be 4" and then taper into 3"?

Its just that i have been looking at the past threads and...well i am a little confused!

Also do my98 cars need to be re-mapped or was this just an issue with JDMs?

Beastie

iTrader: (2)

standard pipework is 2 1/2" so if you have 4" then you have an aftermarket exhaust. 4 " is unusual as 3" is big enough for high power applications.
I would think that you may already have a decat or performance cat if indeed your pipework is 4".

monkeyboy840

my pipe work is 3" for a 330bhp wrx and i could have prob got away with 2.5".

4" sounds ridiculous, but, then again what do i know

unless it means a 4" tail end

munna

Morning guys

the big pipe in question was already on the car when aquired!!..the downpipe cat is still on the car,i cannot find anything in the reciepts that i got with the car stating that an aftermarket sports cat was added..

P20SPD

iTrader: (1)

I suspect your measuring the diameter of the pipe with the heat shields still in place?

munna

he he he...3.5"..Good old fashioned garages,using the latest in measuring technology...EYES!!

Great cesars ghost!!..Now i can get to ordering the de-cat downpipe,spoiler to pick up next week and the roof scoop arrives next week too..

Rally slaaag....