ToastedSi
Senior Member
- Joined
- Apr 5, 2018
- Threads
- 3
- Messages
- 176
- Reaction score
- 103
- Location
- New York
- Vehicle(s)
- 2018 Honda Civic Si Coupe
I'm actually loving the 19.5 and may consider 19.5/21 sport off/on flash haha.I started with the 21# on my Si... then went with the 23# then fooled around with that. You'll hit diminishing returns the more boost you try to run on the stock turbo but even between 21 to 23... the difference was noticable. You ought to be pleased with the difference between 19.5 and 21. On my first flash, 19.5 was sport off and 21 was sport on. You could definately tell the difference.
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