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The ad says "2 stroke" but you didn't say what your scoot is. It likely wouldn't work on a 2 stroke, in spite of what the ad says since 2 strokes require a tuned exhaust. Regardless, these mufflers need to be fitted by hand since the headpipe is different from one model to another. The other reader suggested using a 1" pipe and adjusting it to fit. I've never found one that fits right out of the box. Cutting & welding nearly always required.

Nice paint job! It definitely looks like a TNG Milano. What's it registered as?

When it quits suddenly at max throttle, it could be over-heating (not likely with a new 150cc). If it won't idle & stalls, it's an air leak on the INTAKE side (not the exhaust side). The problem is often cheap Chinese neoprene O-rings that go flat & leak air due to heat. There's 2 of them on the intake manifold. Replace with high-quality Viton O-rings from a motorcycle/scooter repair shop.

Be very careful that you're using METRIC nuts. The hardware store may not have metric nuts, and using the wrong nuts will damage the studs. Home Depot, I believe, at least stocks some low-quality metric hardware, but check carefully! I always get a pocket-full of good quality metric hardware every time I visit an auto-wrecker. They often let me have it at no charge, or just a few dollars.

I tried the tinypic link but it immediately launched a stream of adware/malware offering prizes, etc. Without photos, this new ProBoard site is really hard to use. There must be more light-weight forum board systems available? This one is a real anti-user beast, especially if we have to link up with tinypic. Most systems now have integrated image uploads which are easy to use.

Cleaner engine bay was the plan, which worked out OK. But I didn't expect the power & speed to be cut in half. Attached is the valve cover showing the EGR tube which picks up the exhaust gas at the exhaust port and cools the gas before it's routed to the intake manifold. There's no connection to the exhaust pipe, only the exhaust port.

PS: Sorry! This new ProBoards system is also defeating me!  Can't see how to attach the photo.

One downside of this new site is that it's very difficult to use. I have to request a new password every time I visit since it doesn't seem to recognize me. The security captcha is totally bizarre & requires watching a video. It's like trying to access the National Security Agency! Also I still haven't figured out how to create a new post, only how to reply to an existing post. But even when doing a "Reply" I can't see how to attache a photo, which uased to be easy to do on the old system. Some help notes would be useful since the ProBoards system thinks everyone's a computer/rocket scientist, but I'm just an ordinary scooter driver.