A proper exhaust system and air intake should already be installed before proceeding with an engine build. If you need a stage one upgrade please let us know in the form below.

Items needed from customer:
• Receipt of heads in perfect condition prior to shipping of new kit
• Receipt of throttle body core prior to shipping new throttle body

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128" Big Bore Kit Pricing & Options for 114-117" M8 Models (copy 1)
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