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The OE system has a 8.5" opening on the rear deck for an OE sub. I have a 12" sub suitable for IB with a 9" cone area. My plan is to build a "step-down" spacer (12"-8.5") and mount the sub there.
Can I get away with not enlarging the hole without causing any issues? Basically, a 12" sub firing through an 8.5" hole.
 

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The OE system has a 8.5" opening on the rear deck for an OE sub. I have a 12" sub suitable for IB with a 9" cone area. My plan is to build a "step-down" spacer (12"-8.5") and mount the sub there.
Can I get away with not enlarging the hole without causing any issues? Basically, a 12" sub firing through an 8.5" hole.
Yes, the opening is plenty, but you still really want a baffle behind the rear seats. The point of IB is to separate the rear wave from the from wave using a baffle that prevents the rear wave from getting into the cabin. Unless your rear seats are backed by a lot of metal, the rear wave will easily pass through the seat foam.

What kind of car is this going into? What materials are there between the trunk and cabin? To really benefit from the high quality bass that IB provides you need to ensure that the rear wave is blocked, so in all likelihood you need to build a baffle for the rear deck, and rear seats.
 

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KS in da house lol
 

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The OE system has a 8.5" opening on the rear deck for an OE sub. I have a 12" sub suitable for IB with a 9" cone area. My plan is to build a "step-down" spacer (12"-8.5") and mount the sub there.
Can I get away with not enlarging the hole without causing any issues? Basically, a 12" sub firing through an 8.5" hole.
A two to one compression ratio is no problem, air is easily compressible.

I've run compression ratios of ten to one and ran into issues, but even that is doable if you add a coupling chamber in front of the woofer to reduce turbulence.

 
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