Review on AP Exhaust 4678 Manifold Spring by Wayne Brunson

This product has greatly improved our vehicle's performance! Based on our own experience we would highly recommend it to anyone looking for a quality manifold spring. The installation was easy and THE results were noticeable immediately .Our vehicle has better acceleration and overall throttle response. The only downside is that it may be a bit expensive for some, but the improvement in performance is definitely worth the investment..