This isn't what you asked but I will give my opinion. Unless you have a highly modified engine & are going raceing, the Ram Horn manifolds with dual ex. are all you need & the best way. If you buy a ready made dual system it should fit the stock manifolds. I always take mine to the local muffler shop & have them build the duals. You get your choice of outlet possition & mufflers. I use 30 in. glasspacks. They flow good & have a deep mellow tone & are not loud. I have a set of headers I will give away if you pay the shipping.
