I am thinking of using a single IB318 IB in my trunk. My trunk space is 14.2^3ft. The vas of the driver is 381l which is nearly the same volume as my trunk. Is the IB318 too big for my trunk to run IB?

I have read that the overall volume of the trunk space should be three times the vas of the driver(s) in an IB setup.

I thought the 3x vas "rule" only applied more towards home audio use. I have tested and installed a few ib setups in cars. But the biggest woofer was a 15 and mostly 12s. You shouldn't have a problem.

It will still just act as a large sealed box, I'm planning the same route for my Elantra as well.

Edub, what are specifically worried about?

It will still just act as a large sealed box, I'm planning the same route for my Elantra as well.

My number one choice is two 18w6 sealed in about 4^3ft. The IB318 is another one of my options if the 18w6's do not come through.

Edub, what are specifically worried about?

I am looking at many options and picking the best one for my goals. I do want to maximize my subwoofer setup for SQ, if it gets decently loud too that will be a plus!

Cone area is king in an automotive IB setup. I run a pair of Fi IB3 18s and couldn't be happier. When I feel like a little SQ I turn the sub amps down. When I feel like shaking the frame, the sub amps are turned up, easy peasy. Just contact Fi so the subs can be optimized for automotive use, remember these are intended for home use.

Cone area is king in an automotive IB setup. I run a pair of Fi IB3 18s and couldn't be happier. When I feel like a little SQ I turn the sub amps down. When I feel like shaking the frame, the sub amps are turned up, easy peasy. Just contact Fi so the subs can be optimized for automotive use, remember these are intended for home use.

Two IB318 was my original plan. Once I looked at the specs and saw how larger the vas was I didn't think it would be optimal for two in my trunk.

Your car is only ~13" longer than mine, height is 4" less, width and wheelbase are the same.

How big is your trunk? I searched the web to find the cargo capacity for a 1995 Olds Cutlass Cierra but could not find anything.

Two IB318 was my original plan. Once I looked at the specs and saw how larger the vas was I didn't think it would be optimal for two in my trunk.

Your car is only ~13" longer than mine, height is 4" less, width and wheelbase are the same.

How big is your trunk? I searched the web to find the cargo capacity for a 1995 Olds Cutlass Cierra but could not find anything.

I don't know exactly how big it its. I'd have to guess some where in the 14-17cuft range.