Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Will this sub fit in door of 2007 mustang gt. It has factory 8inch subs already want to up grade
Document: Can I just say that I hate leaving feed back on amazon. I really do! they say they publish it and it went live, but whenever I start reviewing recent purchases, guess what? There is no end to what purchases need reviews because Amazon wants me to review the same product again that I already reviewed. Aside from that,  I like these subs. I should have bought a 10 or 12 though, because this sub just does not seem to put out what is rated for.
I just got mine today. I replaced 2 JL audio 8inch W6 with this 1 sub in the same enclosure,and it goes lower and louder.I've had the JLW6 for 6yrs and the foam has cracked on both subs. They were not in direct sunlight..I'm not pushing a lot of power,so I'm not sure what the deal was. JL's are supposedly great quality speakers.Okay now the JBL. Compared to my 2 JL's this thing gives unbelievable lows for it's size.
I used this sub to replace the factory 6.5" subwoofer in my Explorer and all I've got to say is WOW! I've installed and listened to dozens of different subs in countless vehicles and enclosures and this one takes the mighty-mouse award. It easily handles the 200 watts RMS that I'm dishing to it with and MTX amplifier and comes begging for more. The factory enclosure that I have it in is about .35 ft^3 net airspace so it is perfect for a sealed enclosure for this driver.
i uses to replace a factory jbl sub in y toyota avalon and it woed out great. go fit andt sound!! !
This sub sounds awesome if you know exactly what to do with it. However, it was too big to fit in my previous factory 8&#34; JBL subwoofer's spot. Ended up having to drill it into place from the bottom creating a sub-par sound with a slight rattle. Dissapointed in this buy but it's probably my own fault for  listening to other buyers reviews!
I had originally bought this for my charger. (there is a factory cutout in the back deck)While the sub does fit in the cutout. The holes do not line up. Not even close. Plus the trunk liner wont fasten back up correctly with it in. Easy fix though, I bought a box and it exceeded expectations. So much so I bought another one.
Perfect replacement for my factory sub in my 2001 Chevy Tahoe.I purchased this since my Chevy Tahoe subwoofer finally blew. Well, it didn't actually blow but slowly died out. When I took it out the cone was completely eating away.I wanted something cheap that I could just drop in with little modifications into the factory box. I purchased this as the dimensions were correct.This fit nearly perfectly.
I read a few other guys reviews and hw they used this sub to replace the factory junky blown one in my 2002 Avallon. THe JBL system with its about 13 speaker system is awesome EXCEPT the sub has been cracked forever. Their reviews stated how this one fit preciely and sounded great and was compatible with what the JBL system is pushing,... .At first sight we thought this monstrous thick and heavy(and heavy duty) 8" wouldn't fit, but voila!
I have a 2000 Toyota Avalon.Factory stereo is JBL. This is a great replacement for a blown or rattling original bass speaker that is in the back deck under the 3rd brake light. Takes a little modifying to install. I can crank it up as loud as i want now, sounds great. No regrets.
I had some really high hopes for this. After reading the many positive reviews I was sold on its quality but also had concerns on the depth of it since the subwoofer enclosure on my 2012 Jeep Wrangler is already pretty tight. I figured it was simple plug and play without any need for modifications. I was also concerned with wanting to keep everything as looking factory as possible.When I received it I was like, &#34;whoa, this thing looks huge&#34;.
Answer: A check of the mounting depth shows that this sub needs 4-7/8".  I have no idea what the depth of your door is but it would be a tough fit I'm guessing. You'll need to get your tape measure out and see what the available depth is.  Be sure to check this with the window down.  Worst case scenario is the some sort of spacer will be needed.  You could relocate the sub somewhere else in the car.  Low Bass is none directional.  Additional info on the JBL sub can be found here:  http://www.jbl.com/estore/jbl/us/products/GTO804/GTO804_JBL_US