It's there as a pre-muffler. Those 2 small 'shotgun' mufflers aren't big enough by themselves, without being so restrictive that it'd have less power than the S4, maybe worse.What exactly is the purpose of the expansion chamber in the first place ? Might getting rid of it drastically effect the preformance ? Maybe a PCIII would take care of it, but these aren't really available for S4Rs yet are they ?
The more I look at the "cow stomach" the uglier it gets and I keep asking myself why ? Why would they build that instead of just using pipes ?
Anyone know ?