MBRP full system (headers and catback) too loud

[petejk]

I've been running the MBRP street catback system on my 2015 GT for a year or thereabouts, and was very happy with the sound.

In my pursuit of HP gains (stage 2 Whipple on order), I had MBRP catted long tube headers installed. The fitment is great, and I'm sure when paired with the supercharger and appropriate tune, the power released will be significant.

However, my car is antisocially loud now! The only piece of advice I have had in regard to volume has been to switch the MBRP mufflers to Flowmaster 40s, but the Flowmasters themselves are not renowned for being particularly quiet.

Does anyone have any suggestions? I don't wish to overly restrict flow, but would like to drive my car without it sounding like it's capable of waking the dead!

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[BmacIL]

Add some 12" (or 16" or 18", depending on how much you want to lower the volume) bullet resonators behind the H crossover.

 

[petejk]

So a pair of these might do the trick?
http://www.jegs.com/i/Dynomax/289/24248/10002/-1

or

https://www.amazon.com/Vibrant-Performance-1794-Bottle-Resonator/dp/B001804TPI

 

[BluByeU]

As mentioned a pair of resonators will tame that beast but still sound like a NASCAR entry on the back-forty when you you go WOT.

 

[BmacIL]

So a pair of these might do the trick?
http://www.jegs.com/i/Dynomax/289/24248/10002/-1

or

https://www.amazon.com/Vibrant-Performance-1794-Bottle-Resonator/dp/B001804TPI

Yes, or go even longer.
https://www.summitracing.com/parts/pye-mvr203s/overview/

Todd's results when adding these to his Roush AB + H-pipe:
http://www.mustang6g.com/forums/showpost.php?p=870817&postcount=23
http://www.mustang6g.com/forums/showpost.php?p=871335&postcount=27

 

[petejk]

Watching the videos convinced me to order the M80s. A less expensive option than electing to replace mufflers right off the bat.

Thankyou for the suggestions

 

[yohoeimmattbro]

I had Stainless Works headers and got an MBRP Street catback and it was ungodly. I went back to my stock catback and it actually sounds pretty good.

 

[jasonstang]

Change out the h pipe for a resonated version.

 

[petejk]

I had the pair of Pypes M-80s installed today, along with 4inch quad tips, and those resonators have made the magic happen! At idle, the car seems even quieter than it was prior to the installation of long tube headers, but when opened up, makes a fantastic sound. The harshness is completely gone - I couldn't have hoped for a better result.

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