Exhaust piping question

[Leung]

I'm currently installing the Megan Racing header on my A1 engine. so i'm underneath my car trying to unbolt everything but having no luck since everything seems to be rusted out or heavily corroded.

i intend to get the WS2 to complete my exhaust i need help on which cat to buy, with all stock piping and manifold, my A1 had a 13 inch cat.

if i'm using the megan header/flex pipe and ending it with the WS2, should i get the 13" or 14"? isn't the 14" found on the EXs?

[Father Time]

I have that EXACT same set up and I kept my OEM cat. It bolted up fine and is quiet as stock. (maybe barely louder)

[Leung]

I have that EXACT same set up and I kept my OEM cat. It bolted up fine and is quiet as stock. (maybe barely louder)

can you measure your cat for me?

[ikayto]

goto your local auto parts store and look for something called "PB Blaster" it's a very strong lubricating spray that makes taking bolts off easy.

just get the same length cat you already had; bolt ons are made with stock specs in mind.

So apexi designed their catback to fit from your cat and on, and megan designed their header to fit before your cat.

[Losiracer2]

yeah get PB blaster, it might be good to work on the exhaust when its warm since the bolts/nuts will come off easier.

[Cb_JoeyG]

just get the 20$ test pipe of ebay so u dont got ur stock shit slowin u down.. thats how mine was i have an obx header and greddy evo2 catback.. and i was runnin the stock cat. but dude 20$ for a high flow cat is a good deal. only makes it a little bit louder just enough to notice a slight difference but its not to raspy or anything like that

[Leung]

Well instead of unbolting everything, i just removed the rubber hangers and took everything from the factory flexpipe all the way back to the resonator off in one long section. it was rather hilarious when it all came out.

alright so 13" it is..

[js593]

If your having a problem with the nuts on the cat, and you have stripped them, take a size smaller IMPACT ONLY socket, and hammer that shit on there... take an IMPACT gun to it, and remove it. When you put everything back together, take some HIGH HEAT GREASE, and put it on the studs. Also get some stainless steel nuts to put back on, as you shouldnt reuse the old one. If i remember correctly the A1's had a 14 inch cat. the 13's were for the A4, and A6 as they had quieter headers, the cat didnt need to be so big for noise dampening.