Install was a bitch no lie, but it always is the first time the stock cats come off. The header side flanges had bolts with nut side down which is easy and some were nut side up which is hell. If you're gonna go through the engine compartment to remove those demon bolts yes the intakes gotta come out but that really takes a minute each. 1/2' impact wouldn't touch those demon bolts, I had a couple swivels with I think 2 24" extensions on a 24" breaker bar and I slid a 3' jack handle over that as a cheater to get shear the bolts off. I did this with the car on the lift about 3' up with a guy under holding the socket on the nut while I was on a step ladder wringing these things off. I would first try to get these demon bolts from the under side, who knows you might get lucky and they aren't crazy tight. Although I only had 1k miles when I removed mine and it sucked. Be prepared to break a swivel or two using that approach and if it doesn't work then its time to go down through the engine compartment. Putting the new cats on is a breeze less than 15 min for the pair.
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