Miata Mailing List: September 1993, Message #188
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   From: Bill Kim 
Subject: Re: Aftermarket Exhaust Questions
   Date: Thu, 23 Sep 1993 02:31:07 -0400




On Wed, 22 Sep 1993, Mike Rother wrote:

> 
> I've bumped my timing up to 14deg BTDC (now using 89 octane), changed
> the air intake to draw cool air from in front of the radiator (my own
> design - not Jackson Racing), and put in a K&N air filter.  I suppose
> it's time to switch to a more free-flowing exhaust.
> 
> Looking for an exhaust that will do two things:  give me a little more
> power, and have a deeper/less buzzy exhaust sound.  Can you relate your
> experience on any of the following systems?  Particularly:
> 
> 	- your impression of the system's quality
> 	- how difficualt to install
> 	- sound of exhaust
> 	- resulting change in performance.
> 
> ----------
> HKS
> Borla 
> Walker Dynomax
> Ansa
> Trust HP exhaust
> Others??
> ----------
> 
> What have you found out about aftermarket exhaust systems for the
> Miata??
> 
I also have bumped my timing and I have a HKS Intake and I'm about to buy
an exhaust. I have a HKS on order and I'll report on it next week.
I chose the HKS because I did not want to cut up my stock exhaust and the
SS ones like Borla costs too much. I have seen and heard the Ansa on other
cars and they suck. They are buzzy and are of poor quality. I hear the
Walker on a miata with HKS intake and a Millen header and I thougt it
sounded a little raspy. I heard a HKS on a new prelude and it sounded
great! It was really deep sounding. It probably will sound different on
the Miata, but I'll let you know how it sounds by next Friday. I was also
impressed by the quality of the HKS intake so I assume that the exhaust
would be of the same quality. 

I also tried to reroute the intake and found good results, but I found
that the HKS intake makes more power and it sounds better too. The car has
a deep growl at full throttle and sounds a lot deeper even with a stock
exhaust. The buzzyness at high RPM is almost gone too. I highly recommend it!

Bill Kim
'93 B White