Two 75 Imperial Questions -- Vinyl Top Removal and Cam Profile

[Joe Bachan <jbachan@xxxxxxxxxxxxxxxxxx>]

Pardon my ignorance but how does tying the two exhaust
pipes of a dual exhaust system together with an 'H'
pipe improve performance?
joe
--- dardal@xxxxxxxxxxxxxxx wrote:
> Quoting Brad Hogg <roadhogg@xxxxxxx>:
> 
> > Regarding the H pipe.  My muffler guy suggested if
> he were to convert my
> > single exhaust car to dual that he would use
> everything as is ans simply add
> > a second pipe to the right side.  He would just
> create a cut out in the
> > elbow of the...