How did you come up with $510? $120 for the y pipe, $50 for the glass pack $10 for the flange and $15 to have it welded. My math skills aren't the best but that does not equal $510. And after some browsing on Amazon you can get glass packs for less than $30. http://www.amazon.com/Thrush-24214-G...sim_sbs_auto_8