Buddy Club Spec II Exhaust - Honda Civic Si 2012-2015 Sedan engine Signature X Pipe Design -

Signature X Pipe Design - Proper design leads to more power and not a choke point

25) Threading

but add a subtle +10mm of width to the front fenders

wheel fitment issues have been a real thing on the Lexus RC-F and these wide fenders from Rowen Japan will help alleviate this issue

Buddy Club Spec II Exhaust - Honda Civic Si 2012-2015 Sedan engine Signature X Pipe Design -For the Honda Civic Si Sedan only (2012 2015) With 100 percent stainless steel construction and straight through muffler design, the Racing Spec II exhaust system offers both lightweight construction and extreme exhaust high flow efficiency. Torque at low RPM is enhanced by using spring hook type connectors along with an engineered intermediate silencer. Spring hook type connector for better exhaust flow while maintain torque power at lower speed.