A dremel is on my to get list. I had access to one at work but the time it would have taken me to get it then go buy the bit I would have already finished. I cut out a big chunk with a hack saw blade first then filed out the tricky bits. Nice proper looking job. Used a paint brush along with a vacuum to get up the run away aluminium dust. Especially being in the Bahamas and not positive about plenum gasket being reusable I don't just pull it for the fun.
"torque gets you off the line...& hp gets you over the line." - TTKeeper