Our custom Exhaust Headers are engineered to deliver improved performance. The 3.8L isn't a bad motor it just needs more air to breathe properly. NOT LEGAL FOR SALE OR USE IN CALIFORNIA or other States adopting CARB standards. RACING OR NON-HIGHWAY USE ONLY. This is the no-drill windshield channel that is required to install summer briefs and roll bar tops on all 97-06 Jeep Wrangler (TJ).