You have hit the nail on the head. Engines are pumps, volumn in = volumn out. Because of the reformulated fuel we are burning having a larger our more open exhaust should not be a problem, nor should the carb. But leave the top off your air box and see if it run's better/easier to adjust. I have had to cut parts of air box's out in the back (so they don't show) because the snorkel is to restrictive. Not much different at idle but what a difference at speed. Also, mufflers made these days are already less restrictive because they are all made for vehicles that have catalytic converters on them.
Bill
> -----Original Message-----
> From:
> 2cylinderhondas@yahoogroups.com [mailto:2cylinderhondas@yahoogroups.com] > On > Behalf Of > Mario Montes > Sent:
> Tuesday, June 24, 2008 2:10
> PM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> Re:
> [2cylinderhondas] Re: Complete Honda 600 z coupe exhaust
> When you decrease the backpressure, you increase the engine's volumetric > efficiency.
> Depending on how much so, it could easily be adjusted with the > carb's air/fuel mixture screw.
> If it's a drastic change, like a less
> restrictive exhaust and a performance air filter (or getting rid of the stock > airbox), the carbs will most likely have to be rejetted or you run the risk of > leaning out the engine and burning a hole through a > piston.
> Mario
> On Tue, Jun 24, 2008 at 1:55 PM, Steven Michelsen
> stevenm@optonline. net
> wrote:
> > Uh, oh. Miles, what are the the effects of not having proper back > > pressure > > for one's coupe? My coupe is down to one muffler (it is > > stock).
> > Steve
> > ----- Original Message -----
> > From: "Miles"
> > > 600miles@peoplepc. com
> > To: > 2cylinderhondas@ yahoogroups. com
> > Sent: Tuesday, June 24, 2008 3:52 AM
> > Subject:
> > [2cylinderhondas] Re: Complete Honda 600 z coupe exhaust > > > Honda > > 600's thrive on back pressure. A Honda 600 coupe has basically > > > 3 > > mufflers on it and pipes reduce from 1 1/2" to 1 1/4" at the end. A
> > glass pack is not efficient one a Honda 600.
> > Miles
> > > --- In
> > 2cylinderhondas@ yahoogroups. com
> > , "cotton"
> > wrote:
> > >> Is there any reason you
> > can't use a glass pak for a muffler??
> > >> ----- Original
> > Message -----
> > >> From: bobkapp3@...
> > >> To:
> > 2cylinderhondas@ yahoogroups. com
> > Sent: Monday, June 23, 2008 8:03 PM
> > >> Subject: Re:
> > [2cylinderhondas] Complete Honda 600 z coupe
> > exhaust
> > >> Recent Activity
> > >> a..
> > 4New Members
> > >> b.. 3New Links
> > >> Visit Your
> > Group
> > >> Y! Sports for TV
> > >> Access it for
> > free
> > >> Get Fantasy Sports
> > stats on your TV.
> > >> Yahoo! News
> > >> Get it all
> > here
> > >> Breaking news to
> > entertainment news
> > >> Yahoo! Finance
> > >> It's
> > Now Personal
> > >> Guides, news,
> > advice & more.
> > .
> > ------------ --------- --------- ------
> > > Yahoo!
> > Groups
> > Links
> > ------------ --------- --------- --------- --------- --------- -
> > No virus found in this incoming
> > message.
> > Checked by AVG.
> > Version: 8.0.100 / Virus Database:
> > 270.4.1/1514 - Release Date: 6/23/2008
> > 7:17 AM