1. ±4mm Adjustable flanges for stroker or narrower engines.

2. Sport muffler for engine up to 125 HP.

3. SuperFlow muffler for engine up to 150HP.

4. 100% #304 stainless steel muffler, tail pipes and headers.

5. Build in M18x1.5 nuts for Lamda sensor when tuning carburetors.

6. Fiberglass fire sleeve on #2 and #4 header pipes were designed to protect fresh air hoses.

7. Use original 111 298 051A gasket for heater box. 111 298 051A gasket sold separately.

Options:

1. Factory Type 181 style heat riser. #2 cylinder positive pressure side. #4 cylinder negative pressure side.

2. Flange adaptors for muffler to flange heater box. Heater box 35mm flange sold separately.

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