sparks vs sparks big core

[cals400ex]

i was wondering what was the difference exactly between these two? on the big core, is just the core/endcap changed or is the whole silencer portion different? thanks

[kahuna4]

the core size is different

[benwa450r]

The Sparks big-core is bigger core and outlet. I added big-core to my regular Sparks exhaust. For $75, you get new outlet attatched ot bigger core, new packing, and 3 rivots. I just drilled out 3 rivots on outlet and pulled old core and packing out, wrapped new packing around big-core and slide it in and rerivot end cap on. It is bigger... and louder than regular core. Performance difference, I didn't notice a big difference. Supposed to increase top end power. Good luck.