Just curious as to why my EG will pop and backfire when I put straight pipes on it, but the sportster I had with straight pipes you couldn't even make it pop or backfire? Does it have to do with that cross over pipe?
I have a fueling box and tried setting it every way possible with same results.Most popping is when I shift gears.

 

A common cause is exhaust leaks. However, i get "dece"l pop, not when shifting gears. BTW, welcome.

 

Not enough back pressure.

 

Thanks for the welcome kromdom.

Why does the EG need backpressure but a sportster doesn't?

 

They all need some backpressure unless you're willing to give up performance in the low - mid range. They're called drag pipes for a reason, they are designed to perform at WOT (wide open throttle) only. Who knows why your Sporty didn't backfire, maybe enough restriction at the head pipe, either way, drag (straight) pipes suck if you're looking for streetable performance.

 

Low end torque.....lower back pressure reduces low end torque but increases flow and HP at the upper rpm ranges. Also has to do with length of the exhaust and pipe diameters in comparison to engine displacement.

 

My sporty will backfire a little if I am coasting or not on the throttle.

 

Typical dealer reply, ''aw, they all do that''.

 

cause sportsters rule.

 

unburnt gas in the exhaust. when you decell pop pop. a sert will help but not fix. my good friend has the thundermax and he get no poping at all and our bikes are set up the same way. 95cid se heads reinharts.