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I have 4 coaxial Polk Audios (DB651) that I removed from another car where I upgraded everything. The Polks still work just fine and sound good for what they are. They have surprisingly good bass for being 6.5". I also installed a Sony head unit in the Pathy a few months ago, but I'm still using the factory amps and speakers. It sounds ok-ish, as these Bose systems did, nothing to write home about but serviceable. Now, instead of throwing the Polks in the trash, I thought that perhaps they could find a new home in the Pathfinder, but I have no inclination to add a dedicated amp or anything else, so they would be powered by the Sony's head unit. The car is not used often enough and I have 3 other rust buckets where I would rather invest in audio. Would you leave the Bose system alone, 200W amp (allegedly), 22 year old paper cone speakers or would it be sightly better to drive the Polks from the HU's amp (about 20 RMS x 4) and bypass all the Bose stuff? I'm sure the new speakers would sound better, but I'm not so sure how much the Bose amp levels the play field with the stock 1 Ohm speakers. If anyone has bypassed the factory amps and can share their experiences, I'm all ears.

Looks like 10-7/32" x 1-11/32", and the total across is 33-7/8". Measured in the dark, with a tape measure, in units the hood wasn't designed in, for maximum accuracy. Looking to return the R50 to its roots?

Sorry for the delay in updating this thread. It was a series of poor connections. Bottom line. Ended up finding a plethora of corrosion and rot on otherwise "good" battery cables, grounds, etc. Started at the battery and worked down, finding a mess. Was really surprised how poorly connected some of the stuff on this thing was, from the OEM side. (There were several connections I made that were bad too.) Patience. A lot of patience. Now I am about to tackle the leaking exhaust manifolds....

I would check the plug wires, make sure nothing's been chewing on them. If nothing jumps out, pull one wire at a time (carefully, easy to shock yourself). If it makes the engine run worse, put it back. If not, then you know which cylinder is misfiring. Then it's a question of spark, fuel, or compression. Check that you've got spark at the plug end of the wire, check that the plug is good, check the resistance on the injector, and if none of that shows the issue, do a compression test. I had this happen recently on mine. Checked resistance on the injectors and found that the injector on the misfiring cylinder was well out of spec. It somehow fixed itself when it cooled off so I've been ignoring it for now, but I imagine it'll remember that it's dead sooner or later.