Which P core do you buy? Any recommendations welcomed.
Link.
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I got the P4 tip, sounds good but does not fit with the spark arrestor.

 

P3 PowerTip

Two Brothers Racing

TBR's P3 PowerTip™ sound suppressor is a recommended accessory for Two Brothers' Stainless/Aluminum ATV and MX offroad exhaust systems with M2 outlets. The P3 is designed to be used in conjunction the supplied spark arrestor screens in the Stainless/Aluminum ATV & MX exhaust systems. A straight-through sound diffuser, the TBR P3 PowerTip quiets the pipe to 93 dB with no significant loss of horsepower. An easy and cost effective method of helping to keep your vehicle in compliance with new noise regulations.

So do I get the P3 to retain the spark arrestor?
Anyone got a P3?