C,mon guys... your all the greatest.... I'm stuck... Just a slip on for now ...header and jet kit to come later.... It must be a White brothers though..:

 

If it got to be a WB pipe I would go with the R4 it looks alot better that the E-series and sounds alot better...I perfer HMF... But I bought my 400 with a WB R4 and I like it....Still like HMF better though...

 

i like my e-series

 

The R4 has been a great pipe for me. It's been on there almost 2 years and still looks new. Gives great low and mid range, but I have heard you get about an extra pony with the e-series.

 

quick word of advise though....you can't wait on the jet kit. Main jets must be changed with the pipe

 

Slip on pipe don't need Jetting changes (atleast most) only full-systems do

 

True.....but i had to because I ride anywhere from 10 degrees to 90 degrees....makes a difference even with a slip-on

 

all i have is a slip on but now i also opened my air box wiht a k&n filter and i had to rejet mine. i run a 155 main jet you can go to denniskirk.com and buy the jets pretty cheap! i have to say i love the e-series i didnt think i would but i really do. im not usually big on wafer pipesso i think the r4 looks better. but from my experiance you cant go wrong with an e-series

 

I dig the R4, mainly because of the looks.