Take some time and read the info on the swamps site as it explains labeling.
The 175/146 is what many call a Stage I injector. Its a 175cc stock nozzle injector
The Unlimited is a 30% over stock flow nozzle.
You need to be comparing the Swamps 175 /30% (use to be called the 175/173) to Unlimited's 30% A code.
Personally I think the 30% is an ideal nozzle for the A code. After that I think the hybrid design offers to many benefits with larger nozzles.
I have not run a 30% A code but have been in a few trucks that had them. Its a very nice mild street towing setup. will break 400 HP will matching air. IMO its a set it and forget injector/plug and play however you want to look at it. With some decent tunes they just work.
How much hp can you squeeze out of the 175/30s?
Read...
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I have seen over 300 HP on a towing tune that won't break 1100 unloaded. Truck also made 375 with very little or no smoke on a stock turbo on a street performance tune. This is with an srp1 though and was holding full pressure of 2900.
Id hope to make just over 400.
I really dont know if youll see 400
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Idk what turbo/ hpop he's runnin but if its decent stuff 400 shouldn't be too hard with s 175/30
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A 238/80 injector would my starting injector if you want to move up the power later. It can do everything a stage 1 injector can do.