As RED92LX50 mentioned, subframe connectors are a good investment, especially on a convertible where chassis flex and cowl shake is a real problem.
The purpose of subframe connectors is to reduce chassis flex (twisting) by tying the front and rear 'subframes' together and making the chassis more rigid and stronger, much like a 'full-frame' vehicle.
Chassis flex from torque will eventually ripple your floorpan and even your quarter panels if you have enough power. Not good.
You also lose traction when the body and the rear axle are twisting from torque - which the 5.0 has in abundance, especially with mods. Last but not least, installing sub-frame connectors will reduce rattles and vibration; you'll feel the car hold the road on curves better and much less rattling over train tracks and bumps, although it may ride a bit harder due to reduced flexing.
Tubular style is best (I have Global-West) and a cross-brace is a good idea and worth the extra money. Have them welded, no question about it. Most muffler shops can do this but check around for prices.
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