You can get a new bracket but this being HKS it won't be cheap. Have a look over on my350z at the HKS thread, theres diagrams showing the differences & even mention of a way around it
http://www.gtmotorsports.com/product.ph ... 266&page=3
This is the one I used with my kit
http://www.merlinmotorsport.co.uk/p3482 ... _info.html
Its the same as this one, you just need to fit the correct stud to install it. I've got 2/3 studs if you need one
There is a thread about this somewhere SpursMadDave worked it out.(well think it was him)
i'l have search althou im thinking it'l probably take years... guess it wont improve massively maybe a couple mpg tops
Correct
Every single person will give you a different answer
If you want something loud then get a single exit with decats & headers - it will make a K1 sound silent
Something a bit more reasonable is HFC with a Blitz Nur Spec. ARC intake makes a much better noise than a pop charger also