Originally Posted by keo1050
Well don't leave me hanging...how was the performance difference.
I don't have a lot of experience of Bonnevilles but I have had some test rides, so I can share my impressions. Three and a half years ago I had a test ride on a 790cc Bonneville and the first of the 865cc T100s, and three and a half weeks ago I had a test ride on the EFI T100. The T100 EFI was fitted with TORs (or "loud pipes" as the dealer called them - they must be joking, they were quieter than the standard exhaust on my Kawasaki ER-6N and other bikes I've owned or ridden with standard silencers/mufflers!). One thing I tried with all three bikes is something I've done to compare the performance of the various bikes I've had or been interested in, which is to ride along at a steady 70mph in top gear, twist the throttle to full throttle, and count to 5 and see what speed it gets up to in those 5 seconds.
My first impression of the 790cc Bonneville was that it was gutless - I couldn't feel any acceleration when twisting the throttle and so it seemed a bit dull or boring. The 865cc version was noticeably better although still not quick. These are the figures for the Bonnevilles and some other bikes I've owned for comparison:
790cc Bonnie (standard exhaust) - reached 79/80mph
865cc T100 (carbs, standard exhaust) - reached 85mph
865cc EFI + TORS - reached 85mph
Suzuki SV650 (Scorpion race can) - reached 90mph
Harley Sportster 1200 Roadster (stage 1) - reached 90mph
Honda X11 (standard) - reached 110mph
So the EFI with TORS seemed to only perform about the same as the carb version with standard silencers. Despite that I'm buying one - I pick it up on Friday.
BTW, the Bonneville isn't the only modern bike to have air injection into the exhaust ports. I had a Suzuki Burgman 650 which had that (called PAIR - Pulsed-secondary AIR-injection system) and I think the Suzuki SV1000 also had it, and the Honda X11 had it. (My Royal Enfield Bullet Electra X also had it, but it was removed when I had the Highway Kit installed [stage 1]).