430 Oem muffler modification?

What’s the goal? I would imagine cutting any pipes would make the flow less efficient. If you’re after more noise, just leave the packing out.

 

Why would you want to ruin a factory muffler? They have value, even the 360 guys will take a 430 muffler, shorten the connection pipes to obtain the CS sound.
Just buy an aftermarket exhaust and sell your old one to someone who wants a stock 430 muffler.

 

This is really the best option unless you’re just bored and know how to weld. Otherwise, it’s a waste of money.

 

It's not really necessary to modify it. When the valves open, most of the exhaust bypasses the muffler anyway. I have an f430 muffler on my catless 360 and it's pretty loud when the valves open. Cold starts are enough to make my seasoned car friends jump. When the valves are closed it's quiet enough to not draw unwanted attention. It's really the best of both worlds.

 

This

Muffler modifications on other platforms are a popular way to improve sound while keeping a stock look. Ive done them on several other cars like my z06, e55, e63 etc with great results. but the 430 is straight piped from the factory anytime you are on the throttle or above 3500rpm.
There is no benefit to cutting it up.

The stock muffler/system is grossly heavy and the straight pipes are loud the tone is coarse and un-tuned.
The X-pipe on the S-Line and the Kline are properly tuned for sound, and are both less than 1/2 the weight of the stock system. The kline being the winner since it also has the option of turning down the volume when the valves are closed.

 

With the Kline, you also have the option of Inconel for a higher pitch and more "add lightness."