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Enjoy the new exhaust sounds ! Keep the cats and don't hit the loud pedal too hard in town - the noise police are upping their game in NB it seems.
What Gerry says. Keep the cats.
First, long tubes with high flow cats give you way more return than deleting cats on stock exhaust, because the factory manifolds are still full of restriction.
To make cats worth deleting, it has to be part of an off road long tubes and mid pipe that delete the cats.
In conversation with Mat Dasilva at the end of the build on my ‘06, with ported heads and Long Tubes with high flow cats, the question came up if deleting the cats would make much if any difference?
Mat has over 3200 tune files he has worked on over the years.
So he has strapped many cars to his dyno, an some return customers several times improving the same tune on repeat occasions.
In reference to my car, a 450 to 500 hp N/A setup, the difference between long tubes with high flow cats and an off road setup with cat delete, would be a whopping less than 5 hp.
It begs the question, would your 500 hp car with high flow cats be any less fun than your 503 or 504 hp car with cat delete?
I don’t think any of us could tell the difference.
Then weigh that against the bad smells, the environment issues and, finally, the risk and constant potential of getting fined, not passing provincial inspection, or not passing emissions should that become a requirement in future.
I’m a big fan of removing resonators, not cats.
Exhausts in general, and high flow cats specifically, have come a long way since Fred’s 83 Monte Carlo.
All cars today can’t be compared to that era.
That was an extension of the 70’s oil embargo and smog restrictions era.