Super Jet Factory B-Pipe

[Lival]

What is the difference between the limited and mod version of the bpipe?

 

[augustaf]

The mod chamber is about 1.5" shorter than the limited version and that is the only difference. I've taken limited chambers , sawed out a section 1 3/8 long and welded it back together. The shorter chamber is easier to install, used to be used for racing. You don't loose a whole lot of bottom end depending on your engine setup. You should use the longer limited chamber for freestyle.

 

[227]

The mod chamber is about 1.5" shorter than the limited version and that is the only difference. I've taken limited chambers , sawed out a section 1 3/8 long and welded it back together. The shorter chamber is easier to install, used to be used for racing. You don't loose a whole lot of bottom end depending on your engine setup. You should use the longer limited chamber for freestyle.

Yup what he said. Just an FYI I have two SJ's which are both set up identicle and are pretty much stock except one has a B pipe with a Limited chamber (Long) and the other has the Mod Chamber (Short) and personally I can't notice a bit of difference n performance between the two, other than the fact that the Mod chamber is WAY easier to install/remove. IMO If you're running a limited setup I 'd go with the Mod Chamber

 

[tor*p*do]

in my SN, the mod barely fits
couldnt imagine squeezing a ltd in there

 

[augustaf]

Most of the leading engine builders insist you use the limited chamber for better bottom end, like in freestyle. Fortunately I'm not " leading" and therefore free to use the easier to handle mod chambers.

 

[tor*p*do]

so true- if I had a big bore stroker motor, I would insist on a ltd
but the mod is fine for my ported 61x at 718 cc!

 

[tor*p*do]

mod on left, ltd on rt

 

[Matt_E]

I used to have both pipes and actually tried them back to back on the same setup.
The ltd did have noticeably more bottom end, but ran out quicker.

 

[McDog]

Art recommended the mod chamber for my 850cc 5mil ADA cylinder motor. He is the only builder that recommends them that I have heard of but the only motor I have tried that hits harder than mine is a XS1000 with a Powerfactor pipe.