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My goal was to reduce backpressure without increasing exhaust noise, the stock catback on my car was a bit annoying at cruise with a mid pitched drone. My car already had Cobb Down Pipes and Mid Pipe with a Borla Resonator. I read everything I could find about aftermarket catback systems and listened to lots of sound clips trying to decide what to buy.
Several of the local GT-Rs also helped eliminate some options
Nismo 3.5" unmuffled = pretty loud Sounds excellent but would probably draw too much attention for a daily.
SBD 4" Race = holy shit thats loud!! The sound is amazing on this, just not for a daily driver WAY too loud!
I also talked to a local with a Meisterschaft it sounded great - but again, just much louder than I wanted!
As I already had DP and Mid-Pipe I was looking for just a cat-back system. The HKS Legamax was in the running, (Thanks majj35 for the excellent audio clips) but its smaller diameter kept me from buying it. I kept looking at the ARMYTRIX for the best of all worlds but my cc squeaked every time I looked at their web site!
I finally settled on the MAP 3.5" stainless muffled version to match the diameter of my Cobb Mid Pipe.
- Shipping was quick
- the tig welds look good
- the brackets have extra bracing with extra long welds on both sides of the rod for strength
- Fitment was good - no drama with rubbing or rattles. I did have to loosen and re-tighten the V-Band and front flange bolts a couple times to get it to mate flush, but once in the right position fit as expected.
- And the best part is the sound. The 3.5" pipe dropped the note much lower than the stock exhaust. I also see that my fuel trims say It is now flowing more air than the stock exhaust!
The end result was exactly what I wanted, less drone and overall cabin noise AND better flow. I did some before/after measurements using Androsensor App on my Galaxy S9 phone.
John-
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