Modern Vespa

I'm thinking of installing an aftermarket exhaust muffler on my 2010 GTS 300 Super. I'm not advanced technical, so I'm not sure if I can tune in a new exhaust system. Which muffler would be the least likely to affect my current performance? Or should I just leave it alone. I just like the looks of some of the aftermarket systems. Any advice welcomed. Thanks

seems a strange question. or do you mean negatively affect? no aftermarket exhaust is likely to be negative affect don't need to tune it. the ecu has a reasonable amount of self adjusting. (a 'real' tune on a dyno is possible but is expensive)

Yes, on the negative effect. Should have stated that, thanks.

Not sure if this is a common negative effect, but there seems to be some observation of a cracked exhaust header pipe over time when using an aftermarket pipe.

I have an Akra and had to replace my header pipe.

This is why the Piaggio bikes use a graphite exhaust collar ("gasket") between the header pipe and the silencer.

Also, aftermarket exhausts tend not to have catalytic converters in them. Not so much a worry (unless you're really keen to keep your emissions down) where emissions aren't tested annually or bi-annually, but such tests are being rolled out all over the place. e.g. many European countries, Japan etc.

most common manufacturers I see offer the cat but it seems common for people to not pay the extra for it.

Leo Vince, comes with matched header pipe. Had one on my GTV three years now and previously on my Yamaha T-Max.
It is made in Italy- next to Vespa . Match it with a Bitubo front shock and you will have a perfect combination

Exactamundo.

When I was younger I always was looking for more after a yr or so of ownership. With a lot of motorcycles it was possible to put a lower restrictive exhaust and intake or air cleaner along w/a tuner. This usually got you more RPM and power, usually at the top where nobody rides much. And many times you lose torque at the lower RPM range where you do ride. But it's big business to advertise all kinds of things you may want to buy. Some times you get a little improvement and some times you don't!. Usually, it's better to leave it alone and just ride it. A loud scooter is more obnoxious than a loud HD IMO. I have owned over 30+ MCs and 6 scooters. BTDT. But- it is your money, so whatever makes you happy.

IMHO, I have played with dozens of aftermarket exhaust on cars and motorcycles over the years and always ended on not liking them and going back to the stock OEM muffler (especially motorcycles after a long 8 hour ride the sound just made my ears bleed even with ear plugs). The best solution for me for cars was when they came up with the electronic flaps inside the pipes that you can mute the full sound via a switch, I have this on my 911 and it works fine.

Having said that, most aftermarket mufflers will saving you weight over the OEM, and they do look better than OEM, but most cause a performance lost (may or may not be noticeable) due to it being more free flowing and a lack of back pressure which is going to impact torque. You may get a slight HP increase but only at WOT towards peak RPM. Do your home work and you may find one that works for you, Good Luck!!

PM Tuning PM68 will do the job very well. It comes with it's own tuned length header and I've never had any issues with it. It was dyno tested during development to give a 1.5 hp increase. It's full stainless and very well made; I've had mine on 2 different GTS 250's for over 20K miles.

On the '21 Scooter Cannonball, it survived my very bad crash; then was transferred to another GTS after that rider had broken 2 header pipes with his Malossi exhaust - and he finished the event with no other exhaust issues.

It can get a bit noisy over time, but it's also easy to repack by drilling out the rivets on the can. Then use new pop rivets to secure. It's also much lighter than the OEM and requires zero maintenance or exhaust gaskets.