Please read the posts and the thread carefully before commenting. Thus far no one has recommended running injectors at 100 percent duty cycle.

To recap, 440cc injectors will support 300 hp at 100 percent duty cycle. Do the math. At 80 percent duty cycle, 440cc can flow 275 hp. You may recall our boy is putting down 175 hp and hopes for 200hp or so. If he needs head room for another 100 hp in his N/A 1.8 motor, he and his tuners are dreaming and dreaming big. If he has 525cc injectors, he has "head room" for another 125 - 130 hp (325 hp N/A B18, sign me up).

Buying oversized injectors is something anyone "can" do but buying properly sized injectors also is something anyone can do, and indeed "should" do.

The injector sizing formula has been around for about 45 years longer than you have been tuning. Here it is:

Horsepower (200) * B.S.F.C. (Brake Specific Fuel Consumption. with .50 commonly assumed) = 100
Divide the number of injectors (4) * .80 (duty cycle) = 3.2
Divide 100 by 3.2 = 31.25 lbs of fuel per hr.
31.25 * 10.5 = 328cc

This means 310cc would be running at no more than about 83 percent duty cycle, leaving you plenty in reserve for any street application. Remember, the 80 percent duty cycle guideline were developed to accommodate engines running at high rpm continuously for long periods, such as in race engines. The figure also is normally used for aircraft applications in which motors run near maximum output for long periods.

As stated earlier, Honda engineers saw fit to outfit ITR 1.8 engines rated at 200 hp with 240cc injectors. This illustrates the gap between street applications and high performance/demand driving. Our boy has a street engine with about the same output and I am recommending injectors a full 70cc - 80cc larger than what Honda recommends. That's plenty and then some.