Just got the p4 tip from 2bros. Wanted to try it out, been running around setting off car alarms with the p1-r tip! (p1-r db ratings -2 to -3)
The p4 db ratings -6 to -7db. I can tell a big difference in sound with very little effect on performance. I'm still trying to get my carb set right, making it hard to tell if there's any loss in power.
I'm pretty sure my neighbors will appreciate it! Any way here's a couple pics from the iphone.


Oh yeh, almost forgot.
The decel pop is less noticeable. Hmmm?

 

WOW... nice to hear some respectable sound reduction w/ the P4 insert, the gang I rode w/ at the last 2 KTM Nat'l Dualsport Series events will love that news!!! Thanks... a shopping I will go!

 

I almost bought that insert. I jumped on the p3 instead, the outlet is smaller than a quarter but bigger than a nickle. Much quieter than w/o, tolerable to my neighbors but not at 4 am. I'd post a pic but am out of room it sayz.

 

Do any of you use the spark arrestor? If so, how does it affect the sound and how often do you clean it?

 

A spark arrestor will only fit the 2bros with a p3 or no tip. Since one is not needed where i live i dont use it.

 

The spark arrester has no affect on sound output. When jetting is correct there is no build up on the arrester screen. Haven't had to clean it ever on the klx250s, on the 2 strokes its a different story.

 

my neighbors must love me, coming home from work at 3am.