I was just going to ask the same thing. I know my Hooker Comps are tucked up in there quite nicely with no clearance issues (although, might be a little too close up on the AOD, though).
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Very nicely done. I like the X-Pipe configuration. For our X-Pipe we did a much more radical turning of the pipes to force a dampening of the shock waves by the exhaust pipe tubular side walls. On the one hand it introduces a bit more resistance to what could have been a smoother flow of gas. On the other hand, it does a nice enough job pf helping improve its prior exhaust system (headers and individual exhaust pipes that go over the rear axle) to have reduced the running temperature of the engine by 2-3 degrees. I am using a 195 degree thermostat with dual electric fans. I had been running just over 200 degrees on an 80 degree day when just cruising at 60 MPH under minimal load. Now the engine temp under the same conditions runs just a little under 200 degrees. No other changes had been made at that time. As expected, I feel no real difference in performance, but the exhaust sound no longer has its prior raspy tinge. I am pleased with the results, even with the fairly extreme turns in the x-pipe design.
Here is a progress video I did of the X-Pipe fabrication and installation:
An aside for "the observant..." The auto transmission oil pan does not look like anything stock in that Mustang. The original C4 was replaced with an AOD unit. The rear axle ratio is a 35:1 TractionLok unit, and at 60 MPH under very light load the engine would spin at just under 2,900 RPM with the C4 in 3rd gear. With the AOD the engine RPM at 60 MPH under very light load, while in 4th/Overdrive gear the engine spins at a very tolerable 1,850 RPM or so. Between the impact of both the AOD and the X-Pipe we now have a very nice cruising vehicle, whereas perviously after 20 minute of driving I was tiring of the exhaust sound.