It depends on what you are looking for; if you want Carbon, then ARMA. If Carbon is not a priority, you are better off getting the CTS.
Also, consider the MAD intake, its high quality, with heat shield and the loudest filters i have heard for an unbeatable price...
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But CG does not come with any guarantee.
If the CEL is triggered, CG won't replace it for free.
We offer both brands by the way, but its important to have full transparency on what you are getting with each option
When companies are talking about the diameter of their exhaust, they mostly mean the mid-section. The connecting sections are all the same size, the same as stock, or else the exhaust will need custom downpipes to fit.
In terms of performance, all exhaust sizes will perform the same
keep it, once its time to sell the car, you can remove the CTS and sell it separately for extra cash
Of course, this only works if you are doing the install yourself.
If you are paying a mechanic, it's not worth it, so you can discard the stock intake.