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Here are a few more details which might be helpful.... OE Harmon Amplifier Connections: Supra Audio System Diagram:

In the mean time simply remove the narrow rear panel shown below which will only take a few minutes...that alone will resolve roughly 80% of the problem until you can get ports installed ...

Actually it wasn't a lot of work for me and as an Engineer I actually enjoy doing these types of investigations...And yes, the Harmon Kardon woofers sound much better than the Bavsound ghost subs after doing a thorough evaluation of both.... Yeah, I considered JL as well until I discovered that...

I'm not convinced that the problem with the Bavsound ghostsub was due to being underpowered given the results of the response curve independently measured by an audio engineer on the BMW forum....In addition, also consider that diminished lower bass response is a common complaint amongst those...

Have you tried this yet? I think you'd be very surprised and pleased with the results...... How to Improve OE Sub Bass Quality and Eliminate Vibrations

I'm glad you mentioned this....I did give that some consideration and actually covered / blocked the ports added to the narrow rear panel to test that theory....The lower bass response of the Bavsound was even worse and also created quite a bit more vibrations...seriously... Adding those ports...

If your looking for a location to tap into one of the high level sub outputs the best place would be near the HK Amplifier speaker output wire bundle shown in the pic below...Within the wire bundle the left sub channel twisted pair is violet / green and right sub channel twisted pair is blue /...

As many of you know I had posted a thread here on our forum a while ago on How to Improve OE Sub Bass Quality and Eliminate Vibrations To briefly summarize, surprisingly, the Harmon Kardon 8" Subs in the Supra are actually very good speakers once you correct some very basic design issues that...

Same here... Mine was showroom Supra as well and they replaced battery and cleared the message before driving it off the lot....

Normal mode 75~ 80 mph highway travel... Here is my custom sport mode settings for driving in city and suburbs when I want some exhaust pops and rumble.... I also have my Supra coded (Bimmercode) to always startup in sport mode and ASD (fake engine noise) is disabled in sport mode...

The search feature is your friend here on the forum....this has literally been the top discussion here on our forum over the past few days! Just look over "recent posts" lists...

Not a fan of the A91 spoiler design anyways....I would take the A91 discounted without the spoiler and get one that looks better!

Once you get your Supra and remove rear narrow panel it will become clearer to you... Here is how I explained it in my first post... "Enclosure Lining / Wadding Template: I was actually able to roll up the speaker batting (wadding) cut from a template (shown below) and slip it through one of...

Bimmercode....

Just sport mode....

I know it's a personal preference by I think Aimgain has the best looking wing available....

Honestly, the scale is a bit too large and out of proportion... I also think they could have done a much better job with this side cover plate...really is very distracting...I'm not a fan of TJ Hunt spoiler either (which is very similar to this one), but they did do a much better job with the...

yes...forum search function is your friend....

Hate the start / stop feature....This was one of the first things I programmed to remember off position (where I would always have to switch off after startup) using Bimmercode so I never need to switch it off now...