Finished in wrinkle red powder coating with a unique laser-etched aFe POWER logo for a custom look. TIG-Welded 2-1/2" Aluminum Pipe. Powder Coated Wrinkle red for Heat and Corrosion Resistance. 2004-2005 STI 2006-2007 STI 2008-2010 STI 2011-2014 STI 2015-2021 STI.