We can load a free base map for free. Free base map loading is always free here.
Our stock modified muffler is not loud. That is the whole point of it. You _might_ notice a little difference _if_ you listen for it. But your mom, neighbors, gf and/or wife wont notice. $100 cash and carry exchange or $140 installed. More info here down about 1/2 way:
http://roadraceengineering.com/blog/?tag=ralliart
You dont have to use the Cosworth filter. The cool kids all dont use oiled filters on hot wire MAFs. But if you are lucky and dont go nuts over oiling the K&N you will probably be ok. You already have it so why change now.
Read through that Bryan/Razorlab/GST base map thread until your eyes bleed. If you want to load one, let me know and bring your pill.
Mike W