This is our new RRR/Hindle Stainless Steel Exhaust for the 1972-77 Honda CB350F/400F. All our Vintage Systems are now purge welded for additional flow, the system pictured is a pre-production tack welded test unit. See images below for dyno charts. For such a small engine the gains in horsepower and torque with just our new exhaust were amazing. Our test bike improved on peak power from 24hp to 28hp with major gains from 4,000rpm all the way to 9,000rpm. Torque values showed a similar increase with a peak torque gain of 4.7ft lbs at 5700 rpm, just where it is needed for strong acceleration. The torque curve shows the value of Hindles 4-2-1 design over the stock system with a strong torque gain from 4000 rpm up to the 9000 rpm redline. The engine invited over rev with no drop in power and with some jetting more power and torque is still available.This race designed system is made entirely from Stainless Steel. It is fully spring mounted in sections for quick installation and removal. The system offers full access to the oil filter and oil drain. Hindle’s unique 4-2-1 design allows for maximum horsepower and maximum torque. If jetting was finessed, still more power and torque is there for the taking. Another bonus is the deep rich sound our Hindle system has