08/09/2026
A few weeks ago we gave Sam's WN Caprice a tune and fitted an OTR intake for him. In that state of tune the car produced 328rwhp (245rwkW). Sam recently brought in the Caprice again for us to fit a set of headers and cats he had acquired. We fitted them, gave the engine a re-tune to suit the modifications and then also tuned the transmission. The headers and cats resulted in a 40rwhp gain, with the car now making 368rwhp (275rwkW). A good result, with more room for gains later if Sam opts for a cam upgrade.