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I origanally had a Bassani which I liked very much!! But now I have Kooks 3" X-Pipe with Hi-Flow cats which I LOVE!! very much. Out of your choices, I've heard the Magnaflow X with the Magnaflow exhaust and mixed with other aftermarket exhaust's & each time they sounded great. I'd go with either the Bassani or Magnaflow
The WCC Tru-X Pipe is a knock off of the Magnaflow. Same look & design, but easier on the check book. I had mine installed at the same time as my mufflers, so I can't say if it alone had any performance value. But i've heard vettes that didn't have it, and mine is a little less burbly at idle. Here's a pic of what it looks like:
Did the bassani front and rear X-pipes here, the front was an offroad setup, and suprisingly sounds very good with the stock exhaust. As for performance gain, maybe 5-10 horses from removing the cat obstruction, but I did it more for the sound.
Kinda cool, the front pipe has an x crossover where your cats would be, and you also get the rear x crossover as well. Most offroad setups sound pretty raspy, I believe the use of these 2 crossovers helps alleviate that quite a bit. It's stockish quiet driving around town, and when you get on it, it wakes up (definitely louder than stock)! From in the car, it sounds a little raspy and high pitched, but from the outside it actually has some pretty nice throat to it. I think it's a great medium b/w stock and those cat-backs that tend to drone a bit.