1. Sound, Visual Aesthetics, Weight, and Performance, Very Impressed with the M4 Slip-on
Really like this M4 slip-on, all my exhaust problems are now solved.
Given only two cylinders, and with it's lower RPM operating range compared to super sport, stock exhaust pipes can sound perhaps a little bit boring on sports bikes 500cc and below.
But with a good slip-on modification, a sports bike exhaust sound could be spiced up, the bike's look improved, the performance increased, loss of a few extra pounds of material weight gained, and a better balanced and centralized weight distribution achieved.
First, the shorty that I bought to replace stock exhaust sounded too monotone, had a unpleasant low-bass frequency sound, and it sapped-out significant horse power. So I had to keep searching for the right slip-on. Then considered buying the Yoshimura Signature R-77 Slip-on exhaust, but the price is so outrageous everywhere. Finally, discovered the M4 at STG and bought it for my CBR500R.
The M4 has a nice, smooth, clean but powerful tone that roars, sings, and soars through the RPMs. I mean it really brings out the sound character of optimum performance that I like about sports bikes. The performance increase was also felt instantly across the whole spectrum of power-band. I was like, wow, this fixed and improved everything, and apparently does not need to be further dialed-in on a dyno adding other mods or programs like perhaps some other shorty slip-on might.
You know it sounds good when you can hear the intricate precision of the machinery at work, outputting the engines HP in beautiful frequencies of exhaust and sound output. It's like they properly equalized the pipe so it performs best and sounds right.
And like most exhaust systems, this M4 also has a really nice crackle and rasp on deceleration at certain rpm, it over-all sounds more exciting than stock but still retains the soft-cool-mellow character of a properly tuned and baffled pipe. I mean that it's not obnoxious or loud, and does not cause hearing fatigue due to low-bass frequencies that you might find in the sound frequencies of some other shorty slip-on pipes.
The M4 is an amazing modification over stock, it is probably one of the very best carbon race pipes out there.
But if I had to purchase the M4 again, any other material option offered would also be great, because the down-side of carbon-resin is the need to repack the fiber every five thousand miles to prevent discoloration. This carbon slip-on looks awesome, so the material selection consideration also depends on the color and aesthetics of the whole bike. So all of those different material choices offered at check out are of course also subjective to preference for artistic appeal.
Installation was self-explanatory, but just look at an example also review the information.
Don't know about stage-two baffle, but the stage one (baffles are sold separately) sounds good, it is not too loud but is the least quietest available. Be sure to use Lock-tight to fasten and secure the baffle bolt.
The M4 is an amazing modification, but can only speak about it for the CBR500, yet it is probably one of the very best carbon race pipes out there. It works great on my street bike, goes great with a K & N air filter, still debating Power Commander V for Honda (Fuel & Ignition) for a final mod to further increase performance, but maybe not though because everything sounds and runs great now, in great part thanks to this M4 slip-on from STG.