Hey guys i just picked up a used hks exhaust but it came with no gaskets or bolts. i was wondering if i am able to use my stock bolts to install this exhaust and if i could use my stock gaskets.

if not where could i buy bolts and gaskets for this exhaust i have been reading up and people have been saying the gaskets maybe hks specific

 

you can use your old ones i did !

 

Isn't the oem exhaust diameter smaller then 2.5" which would cause a bottle neck or am i wrong?

 

You can find bolts and gaskets at any auto parts store. If the one near you doesn't have any, then check a muffler shop. Most auto repair shops should have them too. Depending on the shop, they might charge you $10-20 for the gasket, but any respectable shop wouldn't charge you for the nuts and bolts from their left over parts bin...