yea, im not to crazy about the popping
This I don't think is just an X pipe causing it.
All these guys go on about raspy X pipes and Muscle car H pipes, well I've down loaded loads of vids and mp3's of loads of different combo's, and they are all slightly different but I'm not really convinced its just the H or X pipe being the main cause.
At the end of the day if you want an old school V8 sound then it should be a push rod V8 not an OHC like the 4.6, surly this would have a bigger bearing on sound than the shape of the mid pipe??
Having said that, my V12 OHC Jaguar engine sounds uncannly like a Mopar 440 now I have removed some of the silencers
But the rest of the car/engine setup should also affect the sound, my TR7 V8 has rally spec exhasut manifolds (headers) into a single system via a Y pipe, these are lighter than dual setups and give as much (maybe more) power, single silencer and no cats (not needed in the UK for this model year). This setup is the same as the works rally cars, it used to pop on the back throttle and even spit flames out the back - which was really cool.
But after a carb and cam change it no longer does this, it still pops but a different sound and the exhaust is also much deeper (can still be heard 1/2 mile away though
So I reckon just choose a brand and get it fitted, I'm sure you'll be happy no matter what.