This is the EFRA 2090 Exhaust System with a patented interchangeable stinger design from Alpha Plus.
This new exhaust system comes with 3 different interchangeable stinger sizes 8mm, 7.5mm & 7mm.
Alpha Plus have been working very hard to design, test, & produce high quality break through products and are proud to introduce their new patented design exhaust pipe with the option of interchangeable different size stinger heads. This newly designed exhaust pipe not only provides outstanding performance in low, mid, and high end power, but also provides the option to adjust your exhaust power curve, low end, high end, smoothness, and of course fuel economy. All can be accomplished by simply interchanging to the right stinger size for your special needs and that extra edge of performance.
From a different point of view, you pay for one pipe and you get three different types of exhaust performance. If you are serious about racing, you must have one.