I like oval and ovoid (rounded rectangle) tips.
The SVX seems like it could use something a bit more substantial than the somewhat squished, and constricted look looking OE tips. The thick double-wall of the stock tips makes them look a bit closed-up.
But I would keep the general theme with these.
I like the way those look on this car. (2007 Parnelli Jones Boss 302 Saleen. it is the same tip style.)
Here is a larger size that is not quite as wide, but taller than stock, with the same baffled inner wall, like stock.
http://www.prostreetonline.com/s/fab...ffler-tips.asp
I've always liked the Magnaflow version, as well:
For something a bit different, and to somewhat echo the tail lights I have thought of two pair of ovoid tips... that could be cool.
I could even see using those mufflers, swapped side for side, with the over-axle pipe-work cut-off, and re-directed for an SVX dual-exhaust system. Mufflers end to end inboard, tips and inlets outboard.
Otherwise, there is the Porsche Cayenne system... which looks do-able, too...
StainlessWorks has many different slash-cut oval tips, otherwise, also...
http://www.stainlessworks.net/cart/i...p?cPath=23_168