Question about a cat. converter

[doobiess]

Just wondering ... for our GA's a cat. is cat. right... so basically just matching diameter is all that matters right? Since i think im gonna replace mine with a high flow.. and a new muffler... but im not too sure if im gonna go 2.25 yet... but i assume stock is 2" inlet and out on the cat and same for the muffler... because it looks like neither have been replaced on my car... and i got 220 000kms... they both look pretty rough but work fine.. at least as far as i know...

Also another thing... i might also change o2 sensors... since my mileage blows... and still lets out a funny smell for the exhaust... and all maintence jobs have been done... so im just gonna do the o2's i think...

Also im looking for a highflow cat... i assume best is to go witha magnaflow? or any others that anyone would recomend

[mthegodfather]

I have the magnaflow and love it. Also it is a universal item as long as it is the right size pipe it should be fine. I have 2.25 and it seemed to add a good amount of upper rpm horsepower with out losing much low end torgue.