[b] I Dont Have Very Good Knowledge With Exhaust System, So Need Help With, What Type Of Exhaust System The Coupe Has That Make That Humming Sound, To Install In A Sedan Model...... And Also What Is The Test Pipe And Or Y-pipe.................

 

Browse the exaust forum and search, but here's a few links:

https://g35driver.com/forums/showthr...&page=17&pp=15

https://g35driver.com/forums/g35-sedan-v35-2003-06/47509-finally-got-my-midpipe-highly-recommended.html