▁The ▁tam per ing ▁became ▁so ▁w ides p read ▁in ▁the ▁ 1 9 9 0 s ▁that ▁the ▁National ▁Hot ▁Rod ▁Association ▁( N H RA ) ▁required ▁delay ▁box ▁manufact ur ers ▁to ▁make ▁the ▁delay ▁boxes ▁harder ▁to ▁modify ▁by ▁end ▁users , ▁and ▁shr ink ▁en clos ures ▁so ▁there ▁was ▁no ▁room ▁for ▁additional ▁contents . ▁Se aling ▁the ▁delay ▁box ▁en closure ▁so ▁it ▁would ▁be ▁easy ▁to ▁see ▁if ▁it ▁was ▁tam per ed ▁with ▁was ▁also ▁part ▁of ▁the ▁process . ▁ ▁The ▁N H RA ▁also ▁created ▁rules ▁specifying ▁how ▁a ▁drag ▁rac er ▁elect r ically ▁w ired ▁his ▁race ▁car , ▁requiring ▁rac ers ▁to ▁leave ▁w ires ▁un bund led ▁so ▁they ▁could ▁be ▁quickly ▁and ▁easily ▁trac ed ▁by ▁eye . ▁R ules ▁were ▁also ▁created ▁limit ing ▁how ▁many ▁inter connect s ▁could ▁attach ▁to ▁the ▁wire ▁between ▁the ▁delay ▁box ▁and ▁the ▁transmission . ▁N H RA ▁track ▁officials ▁were ▁emp ower ed ▁to ▁inspect ▁the ▁w iring ▁to ▁ins ure ▁it ▁met ▁with ▁the ▁new ▁rules . ▁The ▁N H RA ▁also ▁began ▁requiring ▁delay ▁box ▁manufact ur ers ▁to ▁pay ▁a ▁fee ▁and ▁submit ▁delay ▁box ▁designs ▁for ▁the ▁N H RA ' s ▁appro val . ▁Then ▁the ▁N H RA ▁instit uted ▁rules ▁which ▁allowed ▁only ▁N H RA ▁approved ▁delay ▁boxes ▁at ▁its ▁race ▁tracks . ▁This ▁included ▁reve aling ▁trade ▁secre ts ▁to ▁the ▁N H RA , ▁while ▁the ▁N