Gintani has a unique X-pipe that puts the X in a forward position versus the others. They claim it enhances torque. In general, you should know that complete cat delete will have a noticeable smell and will be very loud. Gintani is among the louder exhausts but their sound is very distictive and quality is great.
Comes down to prefernce but I've tried both ways and I like the HFC + resonators + tune. Good power gains and slightly more refined sound and controlled smell.
2009 Silverstone II E92 M3 Coupe - DCT
Dinan Exhaust, RPi scoops, Dinan Tune, Dinan Pulley, BMC filter, LCI Taillights, MS 15mm spacers, Huper Optik tint.