This pipe shows considerable gains over the SHO style pipes. The equal Length is what alows teh exhaust gas to scavenge better by mixing instead of being forced into each other like the SHO pipe. The equal length also eliminates the drone the stock Y-pipe created. As far as back to back dyno from stock to Brullen, there haven't been any, but there have been consederable gains over the SHO pipes. Thanks
