Exhaust simple question...
 

Im getting a bit:confused: with the exhaust "bits" as in what i need, is there 3 cats on my bug? 1 uppipe 1 down pipe and 1 cat pipe? plus a mid box or am I way off? Iv been told by the previous owner its got ported " headers" WTF is that lol and can I prove it ?:wonder::lol1: cheers lee

Std a Bug WRX (not STi) does indeed have 3 cats as you say. See here:-

http://www.scoobypedia.co.uk/uploads..._schematic.gif

You'd need to get under the car and take a photo of the headers (bolted to the underside of the block halves), for us to see if they've been changes to tubular - and, usually, equal length - jobs...

Ported headers are the OEM headers which have been gas flowed for better performance........so will look normal

http://scoobytuner.com/graphics/ExhuastDiagram.jpg

is a diagram of the bug WRX

Shaunh

Cheers lads cleared it up for me, so basically a turbo back exhaust plus an uppipe to fully decat, is there a good amont of torque/hp doing this b4 a remap? cheers lee

Oops, sorry you said ported, not tubular.

But yeah, basically for up to 400bhp:-

*A set of harvey's OEM ported headers (if yours aren't) + OEM ported uppipe (harvey will advise on uppipe type/size etc.)

* New Age pattern bellmouth decat d/p (replaces the OEM 2-part dual-cat job), plus decent system.

Can use either a 2.5" or 3" d/p + system for upto 400bhp.
For over 400bhp then need to have the 3" exhaust parts, plus a move to equal-length tubular headers/uppipe...


Changing to the above exhaust parts will maxmise any power gains in the remap. :)

Nice 1 dude exactly what i needed to know, up to 400 will be plenty its standard now bar uprated brakes and tein suspension:thumb:

Would this be any good for a decat? http://www.ebay.co.uk/itm/SUBARU-IMP...item3368f0b3f9 cheers lee

Ok just found out its got a cat - back system and ported headers, how can I measure the pipe bore without taking it off is that possible?

Wrap a tape measure round it to find the circumference.

Then do this calc:-

diameter = circumference divided by 3.14159

That'll give the outer dia. -- so subtract about 6mm (c.3mm for each opposing sidewalls thickness) = inner diameter. Simples

Now if I would have listened in school I prob would have known that lol cheers :thumb:

Im guessing it will be either 2.5 or 3 inch ?

Nah, won't it'll be that huge.

Prob more like in the region of 40mm ID (or about 1.6")

...Then follow this:-

That'll give the outer dia. -- so subtract about 6mm (c.3mm for each opposing sidewalls thickness) = inner diameter. Simples

Really? it is a SS catback system though?

Il just measure it and find out lol

MY BAD! :cuckoo: :brickwall :Whatever_ :o

I thought you said uppipe!!! LOL

It's this static air and heat -- I need a lie down. :(


Obviously yes, it will be either 2.5 or 3 inch for the exhaust sytem - a quick measure will confirm ;)

If it is a 3", check to see if the downpipe/centre section flanges isn't a reduced 2.5" one....

LOL no worries appreciate the advice m8ty, find out more about this car everyday, its got a KnN panel filter, SS catback and an LMA(?) BOV but never been mapped? So im thinking uppipe and downpipe....jobs a good en.......for now lol