whoosh motorsports has worked with Thermal R&D on a few Ford ST projects, the newest being the Explorer ST exhaust
The Explorer ST exhaust will feature 2.5" pipework throughout with optional / add-on 2.5" midpipes. The mid-pipe option is seemingly the part missing from all the other options on the market. With stock or SPD downpipes, you'll notice flow improvements with larger matching mid-pipes over the dinky stock pipes.
Look for this new exhaust release here and on Facebook in a few weeks. Pricing to be determined but I can promise with the added mid pipes the system will cost less than the other kits currently on the market
here's a pic for attention of our best selling Fiesta exhaust