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      07-04-2020, 12:44 PM   #1
DL335D
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So quiet here. I just slapped on a Megan Racing exhaust and while I do like the sound right around 3,800-4K it pretty much seems to die in volume after 4K. I'm also getting quite a bit of drone 1,800-2k range. So much that my wife doesn't like driving in the M. I've had aftermarket exhausts on pretty much all my cars (34, yep I have a problem) and never had drone quite this bad.

A few questions: Would deleting the secondary cats help with drone and increase the volume higher I'm in the RPM range and still keep me safe with MA inspections?

I've searched and it seems like test pipes are the best way to go, but even if you get a tune you still won't pass the readiness inspection?

What have you guys done?
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      07-04-2020, 06:28 PM   #2
pbonsalb
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Mine is loud right to redline. But itís a bit too loud at low rpm around town. I have an x pipe with 4 resonators. Itís better on startup since deleting cold start. I have been saying I will change it for about 4 years but sort of like it so changing has not been a priority. My wife complains about it but she does not drive the car much.

Yes, catless causes inspection issues. Just test pipes tends to be more likely to pass with 02 extenders or mini cat extensions extenders but no guarantees. No cats and you will almost certainly have to swap back to a stock midpipe.
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      07-26-2020, 05:05 PM   #3
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You can pass in MA with test pipes. 100% certain. Mass let’s you have 1 monitor not ready. You may have to swap software (takes 10 minutes) for the test but that’s it. The tuner will give you 2 separate files for this. DM me if you want the name of the tuner.
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      07-30-2020, 11:04 AM   #4
Tinberland21
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Yea, Mass does let you have 1 monitor not ready. Just gotta drive around with a obd2 scanner that reads readiness monitors and catch it just right. Have all the monitors cleared except for CAT monitor and just go straight for inspection. I do this every year!
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      07-30-2020, 01:30 PM   #5
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Quote:
Originally Posted by Tinberland21 View Post
Yea, Mass does let you have 1 monitor not ready. Just gotta drive around with a obd2 scanner that reads readiness monitors and catch it just right. Have all the monitors cleared except for CAT monitor and just go straight for inspection. I do this every year!

Use to take me 50-100 miles for the drive cycle readiness monitors but I followed some drive cycle directions posted on in these forums last few years and have been able to get it on the 1st attempt and about 20 minutes. As I recall the key thing I was missing was to allow the car to idle for a few minutes on start up and also let it idle for a few minutes before shut-off. The rest of it is is just driving slowly and steadily with low rpms.
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      07-30-2020, 02:24 PM   #6
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This is good to know as I have 8 days left to get my inspection, does anyone have shop recommendations for NH sticker?
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