Is it an after market mani or the one off the jdm 4efe ? You need to remember that there arnt any exhausts that will bolt straight on so it's custom job all the way. A cat back system is about 240 so for a complete straight though will be about 300+ I can imagine, The jdm mani is a direct bolt on I beleave ( dont quote me on that ) but if your power hunting you you deffo want an obx or rw developments one James