First, I'd like to add Kinetix high flow cats to this list. Their install brought on a vicious rasp that was not my cup of tea to say the least. I tried to tame it with several exhaust mods but in the end it was the re-installation of the OEM cats that cured my problem.
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Second, I don't understand this idea of bolt on mods not being "worth it". Worth what? If its money then what is the magical $/HP number that is worthwhile? And who makes that call? A $500 tune has been proven time and again to yield ~15whp, which is about $33/HP. By contrast a stage 1 supercharger kit goes for around $5K and yields 100hp ($50/HP). A custom single turbo kit - $15K for 200hp ($75/HP). Obviously those are very loose numbers my I think my point is intact. Bolt on mods are not necessarily less worthwhile than big ones, unless of course you go buck wild and buy everything available whether it works or not and pay huge install fees. In that case you may end up with a turbo kit sized bill and decidedly less to show for it. But i digress... Another awesome aspect of bolt on mods is the ability to DIY, which for me is huge. Its one of my very favorite things to do and to be honest I don't really care how much it costs. Its a car, not an investment, and speaking of things it isnt - its also not a race car. My personal enjoyment is worth much more to me than dyno slip.
/rant
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Second, I don't understand this idea of bolt on mods not being "worth it". Worth what? If its money then what is the magical $/HP number that is worthwhile? And who makes that call? A $500 tune has been proven time and again to yield ~15whp, which is about $33/HP. By contrast a stage 1 supercharger kit goes for around $5K and yields 100hp ($50/HP). A custom single turbo kit - $15K for 200hp ($75/HP). Obviously those are very loose numbers my I think my point is intact. Bolt on mods are not necessarily less worthwhile than big ones, unless of course you go buck wild and buy everything available whether it works or not and pay huge install fees. In that case you may end up with a turbo kit sized bill and decidedly less to show for it. But i digress... Another awesome aspect of bolt on mods is the ability to DIY, which for me is huge. Its one of my very favorite things to do and to be honest I don't really care how much it costs. Its a car, not an investment, and speaking of things it isnt - its also not a race car. My personal enjoyment is worth much more to me than dyno slip.
/rant