I would have went 987 airbox but the difficulty in fitting one in swayed me away.
I'm still working on my new setup but for now its an aluminum airbox with a cone filter inside, a snorkel attached on the outlet, fed to the side vent. I cut off the snorkel piece on the stock airbox and used it as a block off plate and used foam tape to seal any possible gaps.
So far I've been seeing 20F above ambient(60F average days) in city and 5-10F on hwy.
My mods now are 3 inch intake tubing(airbox inlet/outlet is 4inch) 997 throttle body and plenum. Headers and catback.